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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
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that sounds horrible. Possible, that your setup is too weak for LR? Do other applications run properly? (Photoshop / Premiere)
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yes they all work great except lightroom classic
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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
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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.
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I tried, it didn't work
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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
and, perhaps:
Basic troubleshooting steps to fix issues in Lightroom Classic | Adobe
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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.
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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/