Players attempting to install or launch Apache: Air Assault on modern Windows systems (Windows 7, 8, 10, and 11) often encounter a specific hang-up. After entering a valid serial key, the launcher displays the message "Checking activation code, please wait..." and freezes indefinitely.

This issue has become notorious in the flight simulation community. It prevents the game from verifying ownership, rendering it unplayable despite the user possessing a legitimate key.

If you have the Steam version (which was delisted in 2015), but Steam tries to launch the dead Activision launcher:

Waiting will never work. Instead, apply these proven fixes in order.

Many players have patched the game’s executable (.exe) to remove the activation check entirely.

Once you bypass the "please wait" screen, you want to ensure it never returns. Here’s how to build a permanent solution.