9.9.5 Update Did Not Work from In App Updater

Just an FYI, when I opened 9.9.4 and clicked “update” it appeared to do the typical download thing, then this popped up on the screen:

However, I went to the other post in this thread, used the link, downloaded the dmg file, and installed it without any issues. Just FYI - thank you!

It appears I’m correctly running 9.9.5 now (Mac OS Tahoe 26.2 iMac M1)

Thank you for reporting.
I just tried it here and was able to update from GarageSale 9.9.4 to 9.9.5 without any issues. That’s why I assume and hope that it was just local or temporary issue.

Do you remember at what step exactly that “(null)” message appears? Also, is there maybe anything non-standard about your internet connection?