When I cook in Unreal, it only takes 1 second...

Delete all cooked and intermediate files from the UE4 project. That worked for me.

Thank you. First project was an old UE 4 project, that  I converted. Then I did a simple  UE 5 project and got the same fail.

You really need to remove ALL intermediate files, open the project again and cook. Also check the cook log in ue5 for errors. 

Thanx, I try that.

Don‘t need cooked，use live sync mode can be useful

Nothing worked, so tried I to reinstall it....But it stops every time with this messages

Don’t select to install UE5 when you run the main installer and download the UE5 installer manually instead.

That at least was network problem. Changed network and I could install it. But the other problem still there...Strange. I also tested the Basic_Virtual_Screen and Basic. Got the same problem. Can it be that I updated my Nvidia Drivers?

Had 2 warnings in log:

LogBlueprint: Warning: [AssetLog] C:\Program Files\Aximmetry UE5beta\UnrealEngine\Engine\Plugins\Experimental\VirtualProductionUtilities\Content\VRTools\SequencerTool.uasset: [Compiler] Load Sequence : Usage of 'Load Sequence' has been deprecated. Please replace or remove it.

LogDesktopPlatform: Warning: Unable to read target info for engine

Try installing the .NET Core 3.1 Desktop Runtime (v3.1.28). I have had success with it

Same here.

Manually installing .NET solved the problem!

NET Core 3.1 Desktop Runtime (v3.1.28) solved it. Thanks

My god thank you! I have been stuck on this for hours! NET Core 3.1 Desktop Runtime (v3.1.28) solved it!