This is Doom 1 and 2 with the mod Brutal Doom pre-packed! There is little instruction needed, so here is how to run it:
1. Extract the folder to wherever you want it to be on your computer
2. create a shortcut for "gzdoom.exe" and place it on your desktop
3. Now right click the shortcut and select "Properties"
4. Under "Target", go past the lase quotation mark and make a space
5. Now after the space, type (or copy and paste) this, "-file brutal19.pk3 DoomMetalVol4.wad"
6. In the end, the shortcuts target should look like this:
"C:\Documents and Settings\Owner\My Documents\Downloads\Games\Brutal Doom\gzdoom.exe" -file brutal19.pk3 DoomMetalVol4.wad
(Minus the part before the -file command)
Now it should be ready to play!