LR Classic wo'n't launch

The first thing that you should try is to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.

Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.

https://helpx.adobe.com/lightroom-classic/kb/lightroom-gpu-faq.html#troubleshooting

https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html

If Lightroom doesn't start correctly the please see "Solution 2" in the document behind the second link.

Troubleshoot GPU issues | Lightroom Classic (adobe.com)

If this doesn't help I would suggest a complete and clean reinstallation.

Please follow the steps below:

• backup all personal data, like templates, presets etc.
• 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://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)

I have the same problem. Is there any solution yet ?

Idem pour moi...

You could try setting 'Lightroom.exe' to High Priority in Task Manager. Worth a try.

1) Reboot computer

2) Start Lightroom-Classic (working or not)

3) Open Task Manager   [Windows Key+X] > [T]

4) Expand the App  "Adobe Lightroom-Classic (2)"  (May look different in your system)

5) [Right-Click] on "Adobe Lightroom Classic"

6) Choose [Go to Details]

7) [Right-Click] on "Lightroom.exe"

😎 Choose "Set Priority"

9) Choose "High"

10) Exit Task Manager, reboot computer, try launching Lightroom-CLassic again.