hello @DanS10 Parallels Support Here! We would request you to follow the steps in this article http://kb.parallels.com/123461 for deactivating Parallels on old Mac. Thanks, Shathish
Unfortunately I do not see that screen referenced in the help article in Parallels 10. I have attached a screenshot to show you what is available to me. I am on version 10.4.0. Thanks!
Hello @DanS10 We have made the necessary changes, Now you can go ahead and try to activate the Parallels Desktop. Please use the below steps to activate the Parallels Desktop.
1. Quit Parallels Desktop.
2. Open Terminal (Finder > Applications > Utilities > Terminal.app)
3. Execute the command: prlsrvctl activate-license-online