Many players face issues with activating Euro Truck Simulator 1.3, including:
Searching for "Euro Truck Simulator 1.3 Activation Code and Email" typically relates to attempts to bypass the paid licensing of or recover a legitimate "legacy" license. Legitimate activation codes for ETS2 version 1.3 (a patch released in February 2013) are issued only through official purchase channels. Official Methods to Obtain an Activation Code
Because SCS Software was a much smaller studio back then, they used a simple verification system. Unlike Steam's modern always-online authentication, ETS 1.3 was a "golden era" offline game. You installed the game, typed a name, an email address, and a 16-character code.
Here is the news most old forums won't tell you:
The request for an activation code and email for "Euro Truck Simulator 1.3" raises several red flags.