No update since May 2020, then Catalog updates lead to error!

[p_shashin]

Lightroom Classic 8.4.1 [201909111355-eb9b68f0] can open any of my previous catalogs on my MacBook Pro 2015 running  Mojave 10.14.6

Lightroom Classic 9.3 [202005281810-476e492c] cannot open any of my previous catalogs on my MacBook Pro 2015 running  Mojave 10.14.6

Whenever I try using the new release (or the previous one), I get the following error message : “ Lightroom encountered problems when trying to update the format of the catalog file and cannot use this catalog in this version of Lightroom”

https://helpx.adobe.com/lightroom-classic/kb/lightroom-error-catalog-cannot-be-opened-lrcat-lock.htm...

The error seems to happen during the optimisation of the catalog.

Any clue to help me help the photographers I support?

[AxelMatt]

for the first step please try to reset the Lightroom preferences.

https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/

If this doesn't help I suggest a clean reinstallation:

• uninstall everything cc including preferences, https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html
• then uninstall the cc desktop app, https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html
• clean your computer of cc files per http://www.adobe.com/support/contact/cscleanertool.html
• restart your computer (don't skip this)
• reinstall the cc desktop app, https://creative.adobe.com/products/creative-cloud.
• if you're unable to install the cc desktop app at this stage, use an administrator account (solution 4 here, https://helpx.adobe.com/creative-cloud/kb/creative-cloud-missing-damaged.html)
• use the desktop app to install your cc programs/trials

This sounds drastic and it is drastic and s lot of work. In my experience this may help in many cases, but I can't get you any guarantee that it's help.