Update: I kept searching and eventually found the files that you suggested updating. I did the modification suggested above, and it seems to have worked.
For anyone else facing this problem, you need to search
C:\ProgramData\Intuit Canada
in the File Explorer. It takes a while. Then open that folder, and you will find the various files mentioned in the Intuit Response above, in this thread. When you find the file, right click, and "open with Notepad" in order to edit it. Hope this helps.
What if there is no UMID file? I am having this "2nd Activation" problem, which seems to be fairly common. TurboTax needs to fix it, not send us editing hidden files.
