HL2 Single Player Maps? Error?

[Cyphersphere]

I beat HL2 yesterday and I've been looking for some single player maps to try out. I've downloaded a couple of maps and keep getting the following error in console:

CModelLoader::Map_IsValid: Map 'Combine_Outpost07Beta' bsp version 18, expecting 19
map load failed: Combine_Outpost07Beta not found or invalid

Anyone know of any maps i can get that are "version 19"? Thanks.

 

[scarecrow1]

Where do u get singleplayer maps from? are they like small episodes? or missions?

 

[Cyphersphere]

Just single missions.