An "Anno 2070 serial number key file" refers to a file or code used to authenticate and activate the PC game Anno 2070. Historically, PC games use serial numbers (product keys) or license files to verify a legitimate purchase and unlock full game features, multiplayer, or digital rights management (DRM) checks.
a legitimate copy but are being asked for a serial key repeatedly, this is often a technical bug with the Ubisoft Connect overlay. Check your email: Your key is usually sent in the purchase confirmation. Ubisoft Connect Client:
This manual backup is the only key file you will ever need.