Modern licenses often allow for cloud sync and mobile usage, which the older version 12 lacks.
When you enter a serial number, the software communicates with Abbyy’s servers to bind that license to your hardware. If you are using a legacy retail copy, you may need to use the "Activate by Phone" or "Activate by Website" options if the automated internet activation fails. The Risks of Using Unofficial Serial Numbers Abbyy Finereader 12 Serial Number Activation 39
If you have proof of purchase, Abbyy’s customer support can often help you retrieve your credentials or provide a path to upgrade to a supported version. Modern licenses often allow for cloud sync and