Lightroom Classic does not open

[Aline Ananias]

I installed lightroom classic but the application does not open, I already uninstalled and installed it again and it did not work, catalog update appears and the entire computer crashes

[florianw5007927]

that sounds horrible. Possible, that your setup is too weak for LR? Do other applications run properly? (Photoshop / Premiere)

[Aline Ananias]

yes they all work great except lightroom classic

[florianw5007927]

I think - i remember that there was 
A) a KEyboard shortcut to start LR in resetted Mode
B) there was a Fixing tool some years ago - no idea if this is still existing

[henriqueribas]

Have you already tried resetting Lightroom preferences?

This link has some information that may be useful on how to proceed. Despite not directly affecting the catalog or the presets, I recommend having a backup of these and of course your original photographs before any procedure for security reasons.

How to set Lightroom Classic preferences (adobe.com)

[Aline Ananias]

I tried, it didn't work

[GoldingD]

Have you tried logging into your Windows computer using a different user account, typically the Admin account, and seeing if LrC will open? If this diagnostic test works, the a problem in the user account you normally use may be the issue.

Is so, see:

Troubleshoot unexpected behavior in specific user account | Adobe

• For MACOS users the MAS solution #3 has been helpful
• For Windows, # 4 has been helpful
• One other Windows member had a registry issue, perhaps #6
• but that is not absolute, so the other solutions may or may not be what is happening.

and, perhaps:

Basic troubleshooting steps to fix issues in Lightroom Classic | Adobe

[sredline]

Having similar issues, I have tried all the fixes mentioned.  Support has had access to my system 3 seperate times and spent 2+ hours each time.  Moving to a different account worked for a few days, it was painful as I had to rebuild parts of my catalog and now I am back to same issue and will not open.  Adobe needs to start commenting on this issue.

[GoldingD]

Update

A specific CACHE file may be at fault:

Mac: /Users/<username>/Library/Caches/Adobe/Lightroom/metrics.json

Win: C:\Users\<username>\AppData\Local\Adobe\Lightroom\Caches\metrics.json 

see : https://www.lightroomqueen.com/community/threads/lrc-cache-causing-crash-metrics-json-but-why.47409/