Hello Welcome to Armaholic forums!
All arma2 and OA content wont be found on steam, Arma3 is the only game with its
community content on steam as well as here.
As far as installing invasion 1944 mod, you need to do the following:
1. Locate your arma2oa directory
if you bought arma2oa on steam then the directory should be here:
C:\Steam\SteamApps\common\Arma 2 Operation Arrowhead
2. Move the @I44 mod folder to the directory.
3. Using steam to start the game, go to your Steam library,
locate the arma2oa game in the list,
right click it then go to properties
then go to set launch options, copy and paste the following code:
"C:\Steam\SteamApps\common\Arma 2 Operation Arrowhead\ArmA2OA.exe" "-mod=C:\Steam\steamapps\common\Arma 2;Expansion;ca" -nosplash -skipintro -nologs -world=empty -mod=@CBA;@CBA_A2;@CBA_OA;@I44
4. once you have the code pasted, click ok, then go to create desktop shortcut button
below, create a shortcut.
5. Double click the shortcut you created and Play.
That code will allow you to run arma2 and arma2oa at the same time, provided you have arma2 as well on steam.
Also note at the start of the code where it says C:\ thats your hard drive, make sure you hard drive is C drive, or something else, i used C as C local disc is standard practice, however in the code for me for my game its H, none the less just make sure yours reflects in the code, and change the letter.
Hope that helps and works.
This post was edited by Gunter Severloh (2018-09-22 19:06, 856 days ago)