1) download deathball19b.zip
2) download db20betapart1.zip
3) download db20betapart2.zip
4) extract deathball19b.zip to x:\...\ut2004\deathball
5) extract db20betapart1.zip to x:\...\ut2004
6) extract db20betapart2.zip to x:\...\ut2004
7) run the "play deathball.cmd" in x:\...\ut2004\deathball
basically all this does is check whether
x:\...\ut2004\deathball\system\deathball.u
x:\...\ut2004\deathball\system\deathballai.u
and x:\...\ut2004\deathball\system\deathball_rc.u exists, then copies x:\...\ut2004\deathball\system\deathball.u to x:\...\ut2004\system\deathball.u

deathball.u should have been copied over to x:\...\ut2004\system correctly, in future you dont need to run that file again unless you have installed another beta patch. if you want to play db without the cmd, just create a shortcut to ut2004 pointing to
x:\...\ut2004\system\ut2004.exe -mod=deathball
9) run shortcut =)
note, running ut2004 with -mod uses its own user.ini, namely deathballuser.ini in x:\...\ut2004\deathball\system\
just copy your existing user.ini over it
