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BetterRed · 07-25-2025, 07:02 PM

I've installed every version of calibre since late 2011 (0.8.?) on Windows 7, 10 and 11 and I have never had to use Administration mode. And I had no problems installing/running 8.7.0 here on Win10 or Win 11.

FTR: my gui.json has "windows_register_default_programs": "2.54.0".

Try running in Safe Mode - if that works, then it's something external to calibre. If it doesn't work, try this:

With calibre not running, rename gui.json to gui.json.save, and then start calibre - direct from the .exe - it will create a fresh gui.json with default settings.

BR

07-25-2025, 07:02 PM	#6
BetterRed null operator (he/him) Posts: 21,843 Karma: 30277270 Join Date: Mar 2012 Location: Sydney Australia Device: none	I've installed every version of calibre since late 2011 (0.8.?) on Windows 7, 10 and 11 and I have never had to use Administration mode. And I had no problems installing/running 8.7.0 here on Win10 or Win 11. FTR: my gui.json has "windows_register_default_programs": "2.54.0". Try running in Safe Mode - if that works, then it's something external to calibre. If it doesn't work, try this: With calibre not running, rename gui.json to gui.json.save, and then start calibre - direct from the .exe - it will create a fresh gui.json with default settings. BR