Hello. Due to a limitation of Windows programs, we are stuck in a Windows XP / 7 environment, however, because of a MacOS program I am also needing to upgrade to MacOS Catalina (10.15). I am currently running Parallels Desktop 13, and from what I can gather I will need to upgrade that to version 18 to keep the balance. Version 19 will not run the legacy Windows, and Catalina doesn't support Version 13. The Parallels site only sells a license for the current version 19, and I was wondering if I were to buy that license could I then download/install version 18 with that key? Secondly, when I enter in my current (Parallels 13) license key into the Parallels 18 installation, it says that my key must be upgraded. Am I able to buy an 'Upgrade' version, or will I need to purchase a 'Full' version? Thank you!
