I’ve just tried the project in UE5.0 and everything seems to work well.
However, keep in mind that the demo maps were made with baked light. They also look good with Lumen, but there are a few changes to make.
You can switch between baked and Lumen GI in Project Settings > Rendering > Global Illumination (disabling Lumen allows you to see the maps as they were intended to be).
If, instead, you want to use Lumen GI, it works very well outside, but some interiors look too dark because Lumen GI is not yet able to propagate the light as well as the baked Lightmass.
To add more light in the interiors, you have to change the lights from statics to movable, move the light component slightly outside the lamp mesh (Lumen in unable to traverse it) and increase its attenuation radius (somehow with Lumen the light is less powerful than with the old system).
If you find some other problems please notify me so I can fix them.
Here a few screenshots made with Lumen GI
