You start out peering at poster of a girl in a bikini, and you are in the mist of Halloween. Everything seems to be going well, you see some VERY good models of scientists dressed up as Frankenstein and ghosts, and you can almost hear them breath a sigh of relieve that they escaped Black Mesa alive. So you trot over to your friend’s house and stock up on Halloween necessities, such as a shotgun, submachine gun, detpacks and grenades... Author : Swiss_Cheese
A very rare patch for Swiss Cheese Halloween, reuploaded for archival purposes!
It's not a patch for converting from multiplayer. It's an update v2.1.0 for singleplayer version of the the mod (v2.0.1). Looks like it removes 2 maps from the game (hall_vamp & hall_trick02) and changes/adds few other files.
Ah you're right, I was reuploading these late last night and misread the site. Updated the download.
Windows Defender flags it as malware infected. I doubt it, it's been pretty infamous at detecting false positives lately.