Tidekeeper v0.5.24
The in-app auto-updater is now fixed!
If you're on v0.5.22 or earlier, you'll need one last manual install: download the .exe installer below. After that, Tidekeeper will update itself automatically — no more downloading installers by hand.
Note: If Windows SmartScreen warns you about the installer, click "More info" then "Run anyway". This will go away once code signing is in place (currently pending through SignPath Foundation).