Temporarily disable strict third-party antivirus software, as legacy installers sometimes trigger false positives.
: If your version is asking for an old "SMS registration" or activation code, it is likely an outdated trial version from the original Sigma Team site. Modern versions from Steam or YUPLAY bypass this system entirely. alien shooter 2 conscription unlock code install
The serial key is typically printed on a sticker inside the CD case. Temporarily disable strict third-party antivirus software