UE5.6.0 Preview

Have uodated to latest launcer. Have a 5.4.4 running perfectly as before. Just downloded 5.6.0 Preview. Have proper vusual studio and .net framework running. Win10 is updated to latest update. 32gb of ram and running a RTX A5000 GPU. Have all unreal engines running on a external SSD. When I attempt to launch latest 5.6.0 install, either from the latest launcher or from the desktop shortcut, it starts up with the spinning hourglass and just stops after about 2 seconds. I have run a verify with same result and did a reinstall with same result. No error message and noting event viewer>windows>applications or sytem. Have always had a smooth install process before this. Also, turned off antivirus with same result.

Any help would be appreciated. Help!!!