I feel so out of touch with 5.4.3.9
But it's the weekend, so I can play
For all those that are not sure:
1. You are best to set BI5 not to automatically update. Do it when you have time to fix it.
2. The pop up screen with the new version is where you tick at the bottom to save the download file, and even the existing exe if you want. I just keep the download files "Retain a copy of the update package" so I can simply double click them to revert to a previous version. They are not controlled, so you do have to go and delete the oldest ones occasionally (from C:\Program Files\Blue Iris 5\Updates in my case).
FWIW: I just updated one server from 54309 to 54311 with no issues. Checking second server and 54309 to 54311 OK too
