My Parallels Toolbox for Mac installation had suddenly reported that my license key is invalid:
Your license key is invalid for this version of Parallels Toolbox. Please downgrade or buy a new license.
A technical issue with Parallels Toolbox.
Before proceeding with troubleshooting, please send a technical report via Help menu > Send Technical Data... > once the report is generated, fill in your contact information and click 'Send Report' button.
To resolve this issue, you need to enter the license key in Parallels Toolbox manually:
- Visit My Account to find your Parallels Desktop 12 for Mac key.
In Parallels Toolbox click at 'I have another key' link:
- Enter and confirm the license key.