Um, uh... v1.5.6 is now out. If you are not using the Mac App Store version, do NOT attempt to update from inside v1.5.5 because it will FAIL. Instead, directly download v1.5.6 and have it replace 1.5.5. v1.5.6 fixes an unspecified bug, which I'm going to guess is the bug that stops 1.5.5 from internally updating. Unique situation. - - https://github.com/ddddxxx/LyricsX/releases/download/v1.5.6/LyricsX_1.5.6+2322.zip