Your old serial number for version 1.0.0.0 is a relic, not a key to modern gaming. Treasure it as a memory of the days when installing a game meant typing a 20-digit code by lamplight, listening to the whir of a DVD-ROM drive.
Do not patch the game to 1.0.4.0 after this—the crack will break.
If you purchased a digital copy from a third-party retailer back in 2010–2011, check your email archives for a code.
If you have already installed the game, you may be able to find the key in your : Press Windows Key + R , type regedit , and press Enter.
version 1.0.0.0 typically involves managing official activation limits or technical registration. Official Serial Key Support
At launch, this serial number also doubled as an "Online Pass," granting the player access to the multiplayer servers and the Autolog network. Why Sharing Serial Numbers Online Does Not Work