Sorry, but it still won't let me install the certificate! It says "This app package’s publisher certificate could not be verified. Contact your system administrator or the app developer to obtain a new app package with verified certificates. The root certificate and all immediate certificates of the signature in the app package must be verified (0x800B010A)"
I made sure to reinstall from the link on the first page of this thread, and I followed all the directions very carefully. I do notice in the latest link it says the certificate is valid from 5/2/24 to 5/2/25. I'm a bit confused, maybe I'm doing something wrong?