Combat Mission Battle for Normandy + all other DLCs - AFAIK, no known way to "install". There's some
hint that it can be "installed" using CMBS medicine, but I don't know how. Also, if I remember correctly, if you install CMBN + CW + 2.0 + 2.12 (in this order!), you can play without activation at all. Haven't tested it in a while - can be different now.
Combat Mission Black Sea - the medicine exists. Install the version provided
here, install patch 1.03 (it's in the same archive), overwrite .exe file with the one provided
here.
Combat Mission Red Thunder - the medicine exists. Install the version provided
here, install patch 1.03 (it's in the same archive), overwrite .exe file with the one provided
here.
Combat Mission Fortress Italy + Gustav Line. The medicine exists for version 1.01.... sort of. Let me translate the instructions from
here
"You need to patch game code in the MEMORY:
.00FE674E: 8AC3 mov al,bl
should be changed to mov eax, esp
It should be done each time during start of the program. Or you can write a loader, which will do it automatically. I've uninstalled the game long ago, so I won't do it". Now, I haven't uderstood a single word from the instruction - I've just translated it. Otherwise,
as of now, there's no known way of "installing" Combat Mission Fortress Italy + Gustav Line of version later than 1.01.