Because you still not crack it before start game. After install, you must open .iso file, you will see "RUNE" folder, copy all files in that folder and paste to your game's dir, enjoy ;)
Create a Mods Folder in Gamedir who Warno.exe is located go to a Steamworksop download site and download the mod what ever you want after this unpack this mod the foldername is 2224857857 or so and drag the folder into the mods folder finish
https://igg-games.com/request-pcgames-pc6.html
All comments asking for updates have been deleted. Any further comments asking for updates will also be deleted.
Or fifth if you also count R.U.S.E., the predecessor to wargame.
Hell you could even consider it the seventh if you decide to include steel division 1 and 2 in your count,
https://youtu.be/63L5-pH3Qsc
You can see tutorial here too (it same for almost games):
https://igg-games.com/how-885614657-to-install-game-and-update.html
reskinned wannabe
Uploaded Image