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To see all available qualifiers, see our documentation.
you must legally own the wads (either acquired from retail, steam or GOG)
and then copy the two WADs on the /path/to/Doom3BFG/base/wads.
make a folder named "master" on /path/to/Doom3BFG/base/wads
copy all the 20 wad files on the folder you made in the previous step.