| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | “Invalid unlock code” | Typo or code mismatch | Re-check Machine ID. Re-generate code. Try running the game as Administrator. | | “Activation limit reached” | Old DRM counts re-installs as new activations | Contact Sigma Team for a reset. Alternatively, use the Revoke.exe tool (if available) on the old PC before uninstalling. | | “Cannot write license file” | Windows permissions error | Install the game outside Program Files . Right-click AlienShooter2.exe → Properties → Compatibility → Run as Admin. | | “Online activation server not found” | Deprecated server | Always choose from the menu. Don’t rely on automatic online checks. | | “Machine ID changes after reboot” | Virtual drive or antivirus interfering | Disable real-time AV during activation. If using a RAM disk or virtual machine, install on a physical drive instead. |
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