Just checked the Blue Iris website. 5.9.9.88 is not available there yet.
blueirissoftware.com
Blue Iris by Perspective Software LLC | Updates

When I opened BI the update dialog box opened and regardless of which button I clicked on the application just closed. I tried it several times and it finally worked.I just edited the reply. You might try a DB compact before trying again.
Thanks for the tip. Went to options and Storage Tab and clicked on "Run DB repair".I just edited the reply. You might try a DB compact before trying again.
EDIT: Note the highlight in this post.
UI3 update, Now add up to 128 cameras!, Upgrade to version 6.x DB format, Other minor enhancements and bug fixes.
UI3 update, Now add up to 128 cameras!, Upgrade to version 6.x DB format, Other minor enhancements and bug fixes.
UI3 update, Now add up to 128 cameras!, Upgrade to version 6.x DB format, Other minor enhancements and bug fixes.
Updated 2 systems from 5.9.9.90 to 5.9.9.91 and had no problems!Anyone having problems updating to .91?
I have 3 systems, one updated without incident, another kept closing BI instead of updating until I rebooted the PC.
The 3rd just keeps closing BI no matter how many times I reboot. The one that worked after rebooting is a Windows 11 PC and the one that won't update is a Windows 10 PC.
Weird, I'll try again tomorrow.
UI3 update, Now add up to 128 cameras!, Upgrade to version 6.x DB format, Other minor enhancements and bug fixes.