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fieldsjj · 04-10-2026, 10:09 AM

I was running version 9.4, and it failed to start today, giving me errors. I decided to update to 9.7 which has been a failure. I ended up uninstalling Calibre, and deleting the entire Calibre2 directory plus the appdata/roaming/Calibre2 directory before it would install. then it won't run, it gives me this error:
calibre, version 9.7.0
ERROR: Contacting calibre failed: Failed to contact running instance of calibre, try restarting calibre

[Errno 2] No such file or directory: '\\\\.\\pipe\\CalibreGUI-Johnx'

b'launched:["calibre.exe"]'
I have shut down the PC and restarted several times to get the install to work and have no idea how to proceed
I am running 64 bit Windows 10 because this PC isn't Windows 11 capable

04-10-2026, 10:09 AM	#1
fieldsjj Junior Member Posts: 3 Karma: 10 Join Date: Apr 2026 Device: iPad Pro with Kindle software	Calibre stopped working I was running version 9.4, and it failed to start today, giving me errors. I decided to update to 9.7 which has been a failure. I ended up uninstalling Calibre, and deleting the entire Calibre2 directory plus the appdata/roaming/Calibre2 directory before it would install. then it won't run, it gives me this error: calibre, version 9.7.0 ERROR: Contacting calibre failed: Failed to contact running instance of calibre, try restarting calibre [Errno 2] No such file or directory: '\\\\.\\pipe\\CalibreGUI-Johnx' b'launched:["calibre.exe"]' I have shut down the PC and restarted several times to get the install to work and have no idea how to proceed I am running 64 bit Windows 10 because this PC isn't Windows 11 capable