can't launch LR Classic on iMac (Ventura)

I am with an iMac Retina, 27-inch, 2017, Ventura up-to-date 13.6.9. LR Classic fails to launch, shut down, relauched iMac, uninstalled, reinstalled LR CLassic, set prefrences to default, tried finding .plist files ... whatever I could find to troubleshoot ... still, for a second the intro screen with the silver-tinselled person might appear, then silence again. It's so frustrating, LR cloud-based and PS are still running on this iMac. On my MacBookPro all works. I just don't get what is wrong, very frustrating, anyone with a solution ... would HIGHLY appreciate ....