Lightroom Classic und Sonoma

Did you attempt resetting the preference file?

I would suggest a complete and clean reinstallation by doing the the steps below:

• backup all personal data, like templates, presets, catalog(s) etc.
• uninstall everything cc including preferences, https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html
• 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://www.adobe.com/creativecloud/desktop-app.html
• use the desktop app to install your cc programs/trials
• restore your personal data.

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)

If this doesn't help give us more informations including the following :

• Adobe product and version number
• Operating system and version number
• The full text of any error message (s)
• What you were doing when the problem occurred

Please post the excact version of the products and not phrases as "recent" or latest and so on.

If all doesn't help please contact the Adobe support by clicking the link beow.

Be sure to remain signed in with your Adobe ID before accessing the link below.

You have to allow 'cookies' in your web browser for this to work

https://helpx.adobe.com/contact.html

Click the chat icon in the lower right and type "agent" to get a human and not the chat bot.

If you like you can also use Twitter:  @AdobeCare  https://twitter.com/AdobeCare

Also - beware of answering anyone who sends you a private message or an email.

https://community.adobe.com/t5/community-help/avoid-phishing-3-easy-ways-to-identify-adobe-staff/td-p/10791730