I've used every version of TechTool Pro, since about the beginning. Upgraded to TTP 13 today. After installation, I removed the old eDrive and then added a new eDrive. Check Computer asked to add a Helper Tool, but then never started! I tried a couple of individual tests, which seemed to work. Quit TTP 13 in the eDrive, and ran Disk Utility First Aid, passed. Rebooted into Macintosh HD, and launched TTP 13. Check Computer would launch. I am running the latest Catalina on a high end 2020 MacBook Pro. Lots of storage and RAM. I authorized Full Disk Access. Help, please!
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