They’re blocking each other. That is, none of the update buttons were clickable (just got a beep.) And no way to dismiss the loading progress bar.
Dowloaded from web site to update. All is well.
EagleFiler 1.9.17 and earlier will hang when opening a library on macOS Tahoe 26. You can hold down the Shift key when launching the old version of EagleFiler to prevent it from re-opening any libraries so that you can do the software update to EagleFiler 1.9.18.
Yes, you can also directly download and install the new version.