: Remember that a Parallels key only activates the virtualization software; it does include a Windows license. You must acquire a separate Windows activation key to remove the "Activate Windows" watermark. Parallels Knowledge Base 🔄 The Subscription vs. One-Time Dilemma One-Time Purchase
: A key for version 15 will only activate version 15. If you have upgraded your macOS to a newer version (like Sequoia or Sonoma), version 15 may no longer be compatible, and you might need a newer version of Parallels. parallels desktop 15 activation key
Download the installer from the official Parallels "Legacy Downloads" page. : Remember that a Parallels key only activates