zloty_111: Anybody knows how to solve this?

EDIT: I think I solved it.

If you can play "plain" unmoded version from GOG, but after installing a mod you get "no cd-rom" message, here is what you need to do:

1. Backup your CC5.exe file BEFORE installing any mod (make sure it's working)
2. Install mod
3. Use hex editor (I used HxD, it's free) and compare both modded CC5.exe and your backup CC5.exe
4. In my case there was only one difference between the files somewhere in the beginning (dont remember which line, sorry), and a lot of added lines in the very end.
5. Modify modded CC5.exe from your game directory to have the same values in line as your backup CC5.exe (ignore last lines that are extra in modded exe file and empty in unmodded)