Normally the game should hook just like others. If it doesn’t in your case, please try/check the things below.
- Try to disable your virus scanner to make sure it does not interfere
- Check for other possibly interfering programs. The trouble shooting guide in the vorpX help has a few hints in this regard.
- Try to create a vorpX desktop shortcut to the Arma3 main .exe (right click the vorpX tray icon, choose “Create Desktop Shortcut”). This does not work with all games (especially Steam/Origin/Uplay games), but if it does, it hooks more reliable than the auto detection.
- Try running vorpX as administrator. Generally this is not recommended, but may help in some cases (for example it’s necessary if the game also is started with admin rights).
BTW: For serious Arma 3 playing, I can highly recommend the below in depth setup tutorial. Doesn’t solve your issue, but helps to create the best possible experience once you got it basically running. Quite a bit of work, but pays off.