[PlasmaKrab]

Little technicality here, I'll try to think up a clearer line for the webpage.
"Install the game" is "run the installer you downloaded" all right. No problem here.
When I wrote "intall the custom OOBs", it wasn't about some separate set of OOBs that for some reason wasn't included in the install. It's only that I located the mod's OOBs in a custom OOB folder.
Once you have installed the mod (run the installer), open the game, and in the "utilities" tab of the Game Options screen, click "Manage OOB Sets", pick the custom OOB folder named "ColdWar2020 v0.5", select the OOB files then click "install". The Cold War 2020 mod OOBs are now ready to be used by the game.

This workaround is meant to prevent the installer from deleting root OOBs that may have been modified by the user.

All this is explained in greater lengths in the Readme, but I guess a clearer explanation could be used from the start.

Good game!