If you're definitely installing to your correct Steam Half-Life directory, but the installer can't find a valid HL installation in that folder, it's probably because you haven't played a single-player game of Half-Life in Steam before, so the files (such as hl.exe) haven't been
extracted. Just click Yes to force installation to the directory.
Make sure that you let the installation finish completely... it can seem to freeze for a few minutes at the end, especially if installing full HLSP support to Steam. Please be patient. If installation is genuinely stuck, pre your Windows key and check for any
open DOS windows.
If you've copied your SvenCoop folder from regular Half-Life to Steam, you'll need to run the sc_files_STEAM.bat file in the SvenCoop directory to fix sentence problems/etc. (or vice versa)
Last but not least is er ook een Co-op AfrikaKorps bonus map verschenen die op deze pagina gedownload kan worden.