Unable to install latest version

@doriso82376229 

Check whether you have a file ending 'lrcat.lock' in the folder containing Lightroom Classic catalog. Delete the lrcat.lock file if present, then try relaunching LrC.

If above doesn't work, then you may have a bad install. Therefore, you'll need to reinstall LrC.

Open the Creative Cloud app (CC app), select Lightroom Classic in CC app, choose uninstall, then reinstall. I've attached a screenshot of the CC app that might help.

"The application Adobe Ligntroom Classic can't be opened."

see: (REF 1)

I wasn't able to upload photos to Adobe Lightroom Classic 

Per (Ref 2), LrC v 13.4 is required for that camera

Bring up your copy of LrC.  Click on HELP, click on About Lightroom Classic, what do you have?

However, the download failed and I got the message that I wasn't able to overwrite with the same version

The new LrC v13.5 may or may not be available to you just yet, it might take a day to show up.

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REF 1: https://helpx.adobe.com/lightroom-classic/kb/lightroom-error-catalog-cannot-be-opened-lrcat-lock.html

REF 2: https://helpx.adobe.com/camera-raw/kb/camera-raw-plug-supported-cameras.html