It likely wont work with ArmaA3 multiplayer or any part of the game that uses BattleEye anticheat. I havn’t tried it myself to know if BattleEye pertains to single player as well, but I doubt it. Surely some aspect of the game works if listed on the games page. There is probably a thread for ArmaA3 around here.
What other games did you try?
You had a look at the troubleshooting guide? Make sure you don’t have antivirus running that could block vorpX.