I keep this folder saved in my google drive, usually where I'm able to source updates when folks are able to get their hands on them being that I'm connected services deleted (yay for no telematics module nonsense killing features) and I upgraded from the 8.4 Non-Nav UC5 to the 12.1.
drive.google.com
I installed T27.46 today. I had to factory reset, probably could've just created a new profile, but all the new stuff is there. Since I'm connected services deleted I don't lose any apps since the truck can't phone home to stellantis.