Lightroom 14.2 crashing while trying to import

I see that you are selecting ADD as the import method. Following is not likely, but worth a try.

Select just one photo to import. Change the method from Add to Copy. Pay close attention to the destination. Either attempt an import accepting that destination, or if you think it might be wrong, then change it, and test that import.

Remember, that destination would be whatever was selected previously, if that destination got moved/deleted/renamed outside of LrC, then an error when importing via Copy should occur, But it might not occur if import via Add even though it should not matter.

I give this less than  a 5% chance of being the issue.

Typically this does not result in a crash, just a failed import with no error message.

I've reviewed your Adobe ID and located (23) crash reports from you. That is the good news. The bad news is you are experiencing a specific crash that is not shared by any other customers.  That normally points to a problem with your specific installation.

Recommendations: Clean Install and Preference file reset in that order.  (I know you've done some installing/uninstalling already) 

Clean Lightroom Install Procedure

Close Lightroom

Restart the computer

Use the Adobe Creative Cloud App to uninstall Lightroom

Restart the computer

Install Lightroom via the Creative Cloud App without launching any other programs.

Restart the computer

Launch Lightroom

Wait 5 minutes

A Preference File will survive a Lightroom uninstall/reinstall. Sometimes weird behavior is corrected/cured by resetting the preferences.

Reset Procedure:

1. Close Lightroom.

2. Hold down [Alt/Opt]+[Shift] while restarting Lightroom.

3. Overwrite the Preferences when prompted by the dialog.

4. Close Lightroom.

5. Restart Lightroom.

Does the behavior continue after resetting the preferences?

If, after this, you are still experiencing the same crash, (by all means continue to submit the reports), the next step would be to create a new User on your Mac as a test and verify the crash occurs there as well.