parallels desktop 12 for mac

Parallels' Developer Certificate which is used for the code signature for Parallels Desktop 12 expired Monday, October 22, 2018 at 12:11:00 AM UTC. This is causing Parallels Desktop 12 to crash on launch with the following: Exception Type: EXC_CRASH (Code Signature Invalid) Exception...

I purchased a key for Parallels Desktop 12 and the activation key is marked with a green check mark, however when I activate it the following message appear: This product could not be activated because your activation key is invalid for this version of Parallels Desktop. How can this issue be...

Here's my circumstances... I'm using Parallels Desktop for Mac v12 on OS X El Capitan (10.11.6). I have been successfully running a Windows XP VM for years with zero problems. The MacBook Pro HDD dies. I replace the HDD and recover my OS X system using my most recent Time Machine backup All is...