Question
Is it possible to reinstall Plesk license from a Windows server to a Linux server or vice versa?
Answer
Starting for Plesk 12 version, there are no longer Plesk for Windows and Plesk for Linux licenses. Now, you can install the same license on either a Windows or a Linux server.
Note: if Plesk was previously upgraded from the 10/11.x version, which used not OS-unified license, such license cannot be installed on another OS.