Read the damn instructions?
You need to have a GZDoom or Skulltag install. You also need to have it already loading one of the DOOM (1,2) WADs. I bought the Ultimate DOOM pack on Steam and upon first run of Skulltag, pointed it to C:\Program Files (x86)\Steam\steamapps\common\Ultimate Doom\base for DOOM.WAD
After that and you have Skulltag running DOOM, all you need to do is launch brutaldoomv014.wad (for Skulltag) or the other one for GZDoom.
You'll have to configure particle effects (not sprites) in the video options. Enabling all the texture upscales, nice music is advised.
My configuration file was found in C:\Users\<Username>\AppData\Local\VirtualStore\Program Files (x86)\Skulltag as skulltag-<Username>.ini
Code:
# This file was generated by Skulltag 0.98d on Sat Jan 21 21:14:37 2012
# These are the directories to automatically search for IWADs.
# Each directory should be on a separate line, preceded by Path=
[IWADSearch.Directories]
Path=.
Path=$DOOMWADDIR
Path=$HOME
Path=$PROGDIR
# These are the directories to search for wads added with the -file
# command line parameter, if they cannot be found with the path
# as-is. Layout is the same as for IWADSearch.Directories
[FileSearch.Directories]
Path=$PROGDIR
Path=$DOOMWADDIR
# Files to automatically execute when running the corresponding game.
# Each file should be on its own line, preceded by Path=
[Doom.AutoExec]
Path=$PROGDIR/autoexec.cfg
[Heretic.AutoExec]
Path=$PROGDIR/autoexec.cfg
[Hexen.AutoExec]
Path=$PROGDIR/autoexec.cfg
[Strife.AutoExec]
Path=$PROGDIR/autoexec.cfg
[Chex.AutoExec]
Path=$PROGDIR/autoexec.cfg
# WAD files to always load. These are loaded after the IWAD but before
# any files added with -file. Place each file on its own line, preceded
# by Path=
[Global.Autoload]
# Wad files to automatically load depending on the game and IWAD you are
# playing. You may have have files that are loaded for all similar IWADs
# (the game) and files that are only loaded for particular IWADs. For example,
# any files listed under Doom.Autoload will be loaded for any version of Doom,
# but files listed under Doom2.Autoload will only load when you are
# playing Doom 2.
[Doom.Autoload]
[Doom1.Autoload]
[Doom2.Autoload]
[TNT.Autoload]
[Plutonia.Autoload]
[Freedoom.Autoload]
[Freedoom1.Autoload]
[FreeDM.Autoload]
[Heretic.Autoload]
[Hexen.Autoload]
[HexenDK.Autoload]
[HexenDemo.Autoload]
[Strife.Autoload]
[Chex.Autoload]
[Chex3.Autoload]
[AlreadyRemovedZDoomGLSettings]
[LastRun]
Version=210
[GlobalSettings]
gl_vid_allowsoftware=false
gl_vid_multisample=0
gl_clamp_per_texture=false
gl_texture_format=0
gl_texture_filter=2
gl_texture_filter_anisotropic=1
gl_render_precise=true
gl_fakecontrast=true
gl_seamless=true
gl_render_segs=true
gl_mirror_envmap=true
gl_billboard_mode=0
gl_particles_style=2
gl_sprite_blend=false
gl_usecolorblending=true
gl_sky_detail=16
gl_glow_shader=true
gl_brightmap_shader=true
gl_colormap_shader=true
gl_fog_shader=true
gl_warp_shader=true
gl_blendcolormaps=true
gl_mask_threshold=0.5
gl_nearclip=5
gl_no_skyclear=false
gl_plane_reflection=true
r_mirror_recursions=4
vid_contrast=1.1
vid_brightness=7.45058e-09
gl_vid_compatibility=false
gl_nogl=false
gl_distfog=70
gl_lights_additive=false
gl_light_ambient=20
gl_light_particles=true
gl_light_sprites=true
gl_lights_size=1
gl_lights_intensity=1
gl_lights_checkside=true
gl_bulletlight=true
gl_attachedlights=true
gl_lights=true
gl_texture_hqresize_targets=7
gl_texture_hqresize_maxinputsize=512
gl_texture_hqresize=4
gl_usearrays=false
snd_midiprecache=false
spc_amp=1.875
opl_onechip=false
timidity_frequency=22050
timidity_pipe=60
timidity_mastervolume=1
timidity_byteswap=false
timidity_8bit=false
timidity_stereo=true
timidity_reverb=0
timidity_chorus=0
timidity_extargs=
timidity_exe=timidity.exe
snd_mididevice=-1
mod_autochip_scan_threshold=12
mod_autochip_size_scan=500
mod_autochip_size_force=100
mod_autochip=false
mod_interp=1
mod_volramp=0
mod_samplerate=0
mod_dumb=true
snd_sfxvolume=0.7
snd_output=Default
snd_buffersize=0
snd_samplerate=0
snd_musicvolume=1
snd_waterlp=200
snd_midipatchset=
snd_output_format=PCM-16
snd_speakermode=Auto
snd_resampler=Spline
snd_waterreverb=true
snd_hrtf=false
snd_buffercount=0
snd_driver=0
r_smoothlighting=false
r_columnmethod=1
screenblocks=11
crosshairgrow=false
crosshairscale=false
crosshairhealth=true
crosshaircolor=ff 00 00
crosshair=1
map_point_coordinates=true
vid_forceddraw=false
showendoom=0
queryiwad_key=shift
snd_movievolume=1
mouse_capturemode=1
in_mouse=0
k_allowfullscreentoggle=true
k_mergekeys=true
joy_upspeed=-1
joy_sidespeed=1
joy_forwardspeed=-1
joy_pitchspeed=-0.75
joy_yawspeed=-1
joy_speedmultiplier=1
joy_dialthreshold=0
joy_sliderthreshold=0
joy_zrotthreshold=0.15
joy_yrotthreshold=0.15
joy_xrotthreshold=0.15
joy_zthreshold=0.15
joy_ythreshold=0.15
joy_xthreshold=0.15
joy_dial=0
joy_slider=0
joy_zrot=2
joy_yrot=0
joy_xrot=0
joy_zaxis=4
joy_yaxis=3
joy_xaxis=1
cl_soundwhennotactive=true
joy_guid={00000000-0000-0000-0000-000000000000}
use_joystick=false
m_filter=false
m_noprescale=false
use_mouse=true
crashlog_dir=
crashlogs=1
cd_drive=
cd_enabled=true
vid_winscale=1
fullscreen=true
vid_renderer=1
win_y=-1
win_x=-1
bgamma=1
ggamma=1
rgamma=1
vid_displaybits=8
vid_noblitter=true
vid_attachedsurfaces=false
vid_palettehack=false
vid_hwaalines=true
eaxedit_test=true
vid_nowidescreen=false
vid_refreshrate=0
vid_vsync=false
vid_defbits=8
vid_defheight=768
vid_defwidth=1360
Gamma=1.3
skulltag_masterip=skulltag.servegame.com
sv_showwarnings=false
r_drawspectatingstring=true
snd_flipstereo=false
snd_channels=32
cl_noprediction=false
cl_oldfreelooklimit=false
telezoom=true
chase_dist=90
chase_height=-8
nomonsterinterpolation=false
png_gamma=0
png_level=5
vid_tft=false
show_messages=true
mouse_sensitivity=1
screenshot_dir=
screenshot_type=png
screenshot_quiet=false
autosavecount=4
disableautosave=0
autosavenum=1
smooth_mouse=false
m_side=2
m_forward=1
m_yaw=1
m_pitch=1
lookstrafe=false
freelook=true
invertmouse=false
cl_run=true
demo_compress=true
save_dir=
longsavemessages=true
storesavepic=true
nofilecompression=false
cl_capfps=false
defaultiwad=
queryiwad=true
con_ctrl_d=
cl_allowmultipleannouncersounds=true
cl_alwaysplayfragsleft=false
[GlobalSettings.Unknown]
[Doom.Player]
cl_unlagged=true
handicap=0
railcolor=1
playerclass=Marine
stillbob=0
movebob=0.25
switchonpickup=0
gender=Other
skin=Base
color=60 3f b0
name=wasted
autoaim=5000
[Doom.ConsoleVariables]
g15_showlargefragmessages=true
g15_enable=true
gl_precache=false
gl_texture_usehires=true
gl_spriteclip=2
gl_use_models=true
gl_interpolate_model_frames=true
gl_lightmode=3
gl_fogmode=2
gl_enhanced_nightvision=true
gl_weaponlight=8
snd_pitched=false
r_maxparticles=4000
cl_skins=1
r_drawfuzz=true
r_stretchsky=true
r_deathcamera=true
r_drawtrans=true
cl_stfullscreenhud=false
cl_onekey=false
transsouls=0.75
cl_drawcoopinfo=true
blood_fade_scalar=0.5
cl_identifytarget=true
st_scale=true
hudcolor_stats=3
hudcolor_statnames=6
hudcolor_xyco=3
hudcolor_ttim=5
hudcolor_ltim=8
hudcolor_time=6
hudcolor_titl=10
hud_armor_green=100
hud_armor_yellow=50
hud_armor_red=25
hud_health_green=100
hud_health_yellow=50
hud_health_red=25
hud_ammo_yellow=50
hud_ammo_red=25
hud_showstats=false
hud_showitems=false
hud_showmonsters=true
hud_showsecrets=true
hud_althud=false
hud_althudscale=2
cl_maxdecals=1024
cl_spreaddecals=true
wi_noautostartmap=false
wi_showtotaltime=true
wi_percents=true
dimcolor=ff d7 00
dimamount=0.2
hud_scale=false
sv_hostemail=
sv_website=
sv_hostname=Unnamed Skulltag server
sv_broadcast=true
sv_maxpacketsize=1024
sv_rconpassword=
sv_joinpassword=password
sv_password=password
sv_maxplayers=32
sv_maxclients=32
sv_adminlistfile=adminlist.txt
sv_maxclientsperip=2
sv_nodrop=false
sv_nokill=false
sv_markchatlines=false
sv_queryignoretime=10
sv_minimizetosystray=true
sv_disallowbots=false
sv_colorstripmethod=0
sv_timestampformat=0
sv_timestamp=false
sv_showlauncherqueries=false
sv_forcejoinpassword=false
sv_forcepassword=false
sv_motd=
sv_banexemptionfile=whitelist.txt
sv_banfile=banlist.txt
sv_enforcemasterbanlist=true
sv_banfilereparsetime=0
sv_enforcebans=true
sv_survivalcountdowntime=10
allcheats=false
sv_usemapsettingspossessionholdtime=true
sv_possessionholdtime=30
sv_possessioncountdowntime=10
cl_disallowfullpitch=false
secretmessage=A Secret is revealed!
cl_bloodtype=2
cl_pufftype=1
addrocketexplosion=false
cl_missiledecals=true
cl_bloodsplats=true
cl_respawninvuleffect=1
cl_grenadetrails=1
cl_rockettrails=1
dlg_musicvolume=1
cl_icons=true
cl_medals=true
sv_randommaprotation=false
sv_maprotation=true
menu_modifier=0
menu_dmflags2=512
menu_dmflags=20612
menu_teambotspawn19=-1
menu_teambotspawn18=-1
menu_teambotspawn17=-1
menu_teambotspawn16=-1
menu_teambotspawn15=-1
menu_teambotspawn14=-1
menu_teambotspawn13=-1
menu_teambotspawn12=-1
menu_teambotspawn11=-1
menu_teambotspawn10=-1
menu_teambotspawn9=-1
menu_teambotspawn8=-1
menu_teambotspawn7=-1
menu_teambotspawn6=-1
menu_teambotspawn5=-1
menu_teambotspawn4=-1
menu_teambotspawn3=-1
menu_teambotspawn2=-1
menu_teambotspawn1=-1
menu_teambotspawn0=-1
menu_botspawn15=-1
menu_botspawn14=-1
menu_botspawn13=-1
menu_botspawn12=-1
menu_botspawn11=-1
menu_botspawn10=-1
menu_botspawn9=-1
menu_botspawn8=-1
menu_botspawn7=-1
menu_botspawn6=-1
menu_botspawn5=-1
menu_botspawn4=-1
menu_botspawn3=-1
menu_botspawn2=-1
menu_botspawn1=-1
menu_botspawn0=-1
menu_botskill=0
menu_skill=0
menu_wavelimit=0
menu_winlimit=0
menu_duellimit=0
menu_pointlimit=0
menu_fraglimit=0
menu_timelimit=0
menu_gamemode=0
menu_level=0
menu_browser_showfull=true
menu_browser_showempty=true
menu_browser_sortby=0
menu_browser_gametype=0
menu_browser_servers=0
menu_screenratios=1
chat_sound=1
show_obituaries=true
sv_lmscountdowntime=10
sv_usemapsettingswavelimit=true
sv_invasioncountdowntime=10
cl_showweapnameoncycle=true
sv_duelcountdowntime=10
language=auto
cl_showlargefragmessages=true
cl_useoriginalweaponorder=false
cl_noammoswitch=false
compatmode=0
wipetype=2
cl_hitscandecalhack=true
cl_joinpassword=password
cl_password=password
cl_dontrestorefrags=false
cl_startasspectator=true
cl_showspawnnames=0
cl_showcommands=0
cl_taunts=true
cl_motdtime=5
cl_predict_players=true
chat_substitution=false
chatmacro0=No
chatmacro9=Yes
chatmacro8=I'll take care of it.
chatmacro7=Come here!
chatmacro6=Next time, scumbag...
chatmacro5=You suck!
chatmacro4=Help!
chatmacro3=I'm not looking too good!
chatmacro2=I'm OK.
chatmacro1=I'm ready to kick butt!
cl_showfullscreenvote=false
sv_limitnumvotes=true
sv_nopointlimitvote=false
sv_noduellimitvote=false
sv_nowinlimitvote=false
sv_notimelimitvote=false
sv_nofraglimitvote=false
sv_nochangemapvote=false
sv_nomapvote=false
sv_nokickvote=false
sv_nocallvote=0
sv_minvoters=1
lookspring=true
con_midtime=3
msgmidcolor2=4
msgmidcolor=5
msg4color=0
msg3color=3
msg2color=2
msg1color=5
msg0color=6
msg=0
sv_logfiletimestamp_usedate=false
sv_logfiletimestamp=true
con_colorinmessages=1
con_virtualheight=32
con_virtualwidth=32
con_alpha=0.75
con_scaletext=false
con_centernotify=false
con_notifytime=3
con_notablist=false
sv_logfile_append=false
sv_logfilenametimestamp=true
botdebug_shownodes=0
botdebug_maxroamgiveupnodes=4096
botdebug_maxgiveupnodes=512
botdebug_maxsearchnodes=1024
botdebug_showevents=0
botdebug_showcosts=0
botdebug_showgoal=0
botdebug_showstackpushes=0
botdebug_dataheaders=0
botdebug_walktest=0
botdebug_obstructiontest=0
botdebug_commands=0
botdebug_states=0
botdebug_statechanges=0
bot_allowchat=true
cl_announcer=0
am_ovthingcolor_item=e8 88 00
am_ovthingcolor_monster=e8 88 00
am_ovthingcolor_friend=e8 88 00
am_thingcolor_item=fc fc fc
am_thingcolor_monster=fc fc fc
am_thingcolor_friend=fc fc fc
am_drawmapback=true
am_map_secrets=1
am_secretsectorcolor=ff 00 ff
am_interlevelcolor=ff 00 00
am_intralevelcolor=00 00 ff
am_ovtelecolor=ff ff 00
am_ovunseencolor=00 22 6e
am_ovotherwallscolor=00 88 44
am_ovthingcolor=e8 88 00
am_ovwallcolor=00 ff 00
am_ovyourcolor=fc e8 d8
am_lockedcolor=00 78 00
am_notseencolor=6c 6c 6c
am_xhaircolor=80 80 80
am_gridcolor=8b 5a 2b
am_thingcolor=fc fc fc
am_cdwallcolor=4c 38 20
am_fdwallcolor=88 70 58
am_tswallcolor=88 88 88
am_secretwallcolor=00 00 00
am_wallcolor=2c 18 08
am_yourcolor=fc e8 d8
am_backcolor=6c 54 40
am_colorset=0
am_showtotaltime=false
am_showtime=true
am_showitems=false
am_showmonsters=true
am_showsecrets=true
am_overlay=2
am_rotate=1
[Doom.LocalServerInfo]
maxviewpitch=90
sv_corpsequeuesize=64
forcewater=false
sv_smartaim=1
sv_coop_damagefactor=1
sv_disableautohealth=false
sv_dropstyle=0
[Doom.UnknownConsoleVariables]
[Doom.ConsoleAliases]
[Doom.Bindings]
1=slot 1
2=slot 2
3=slot 3
4=slot 4
5=slot 5
6=slot 6
7=slot 7
8=slot 8
9=slot 9
0=slot 0
-=sizedown
Equals=sizeup
tab=togglemap
t=say
u=taunt
LeftBracket=invprev
RightBracket=invnext
enter=invuse
ctrl=+crouch
`=toggleconsole
shift=+speed
\=+showscores
m=+showmedals
,=+moveleft
.=+moveright
alt=+strafe
space=+jump
capslock=toggle cl_run
f1=menu_help
f2=menu_save
f3=menu_load
f4=menu_options
f5=menu_display
f6=quicksave
f7=menu_endgame
f8=togglemessages
f9=quickload
f10=menu_quit
f11=bumpgamma
f12=spynext
sysrq=screenshot
uparrow=+forward
pgup=vote_yes
leftarrow=+left
rightarrow=+right
downarrow=+back
pgdn=vote_no
pause=pause
mouse1=+attack
mouse2=+altattack
mouse3=+forward
mouse4=+speed
joy1=+attack
joy2=+strafe
joy3=+speed
joy4=+use
mwheelup=weapprev
mwheeldown=weapnext
w=+forward
a=+moveleft
s=+back
d=+moveright
f=+use
[Doom.DoubleBindings]
[Doom.RevealedBotsAndSkins]
[Doom.BrutalDoomActions.Bindings]
q=kickem
r=reloader
[Doom.BrutalDoomActions.DoubleBindings]
[Doom.BrutalDoomInteractions.Bindings]
z=wave1
x=wave2
[Doom.BrutalDoomInteractions.DoubleBindings]
