Try resetting your preferences file:
This procedure works for both Lightroom Classic and Lightroom Desktop.
If you are using Lightroom Desktop it can change the location of your local storage. Please review this setting after resetting preferences.
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 software now launch?
Rikk Flohr - Customer Advocacy: Adobe Photography Products