I fixed the mapshot pack for Qtracker 4.0. You can download it here (it needs to be copied to ..\Qtracker\Mapshots):
http://mitglied.lycos.de/romerogames/temp/Painkiller-Standard.qtmp
Note: direct download works only with FireFox or similar. If you still use IE, you have to browse the folder and download it manually:
http://mitglied.lycos.de/romerogames/temp/
Btw: Qtracker supports now mods for Painkiller. This also includes PK++ servers.