SP maps don't work

[eminefes]

I tried some SP maps like esw1c and kustok, but they wouldn't load. They would come up with errors that they couldn't load a .bsp file in the prog directory. However, MP maps run just fine. What's this all about? Do I actually have to have pak1.pak installed for SP maps to run? I'm confused.

Update: This is what happens loading kustok:

When the level loads up I get a Quake Error message: "Mod_NumForName: progs/enforcer.mdl not found"

Eh, I guess I need the pak1.pak? Damnzors!!!!

[James S]

Yes, the map you're trying to install uses enemies and monsters that are only available in the registered version, so you need to have the PAK1.pak file in there also