Downloading or sharing license keys without permission is a form of piracy, which can have severe consequences. Not only does it deprive game developers of revenue, but it also exposes users to potential malware and viruses. Moreover, pirated games often lack essential updates, bug fixes, and online features, leading to a subpar gaming experience.
: Even if a text file contains a real-looking serial number, most "leaked" keys are already blacklisted by EA. Using them may allow the game to install but will likely block updates or lead to account bans.
The license is often bound to your specific PC hardware.
Searching for a license key.txt" file online is typically a sign of looking for an unofficial or "cracked" version of the game. While the game is over a decade old, it is important to understand its current legal status, digital availability, and why downloading such files can be risky. Current Status of FIFA 16 Official Digital Removal