The community is also a great place to check out. Try these places for help from other users:
Please perform these steps before reporting any issues to the developer to ensure that the game was correctly installed.
If you're encountering issues with launching ARMA 3, make sure everything installed smoothly.
Exit Steam entirely.
Browse to your ARMA 3 installation folder (Usually C:\Program Files\Steam\steamapps\common\Arma 3\)
Run the following installers:
Reboot your computer and test any issues again.
Owners of the Digital Deluxe version of this game can find their bonus content in the following default location:
If the above does not resolve the issue and you are running Windows 7 or Windows Vista, please complete the instructions in our Windows 7 and Vista Troubleshooting FAQ.
If you are running in Windows XP, take the following steps: