Hemisphere is built to be used with Extend default luminance range in Auto Exposure settings in your Project Settings under Default Settings.
Exponential Height Fogactors in your scene.
HemisphereSkyActorto your scene.
HemisphereTimelapseof your choice. Loading a Timelapse for the first time can take a couple seconds depending on your system.
Hemisphere is now set up correctly!
Are you seeing a fully white sky without clouds, or are no Timelapses available when you try to change the Timelapse variable? Take a look at the installation section of this documentation again and make sure to double check your folder structure.