To solve these issues, just restart Unity.
Try to reinstall the asset from the store and make sure that you select all Project Settings:
To solve any issue with Package Manager set the Scripting Runtime Version to .Net 4.x in the Project Settings
or try to reset Packages by pressing [Help -> Reset Packages to defaults]
Set a screen resolution:
Open the Input menu [Edit -> USK Project Settings -> Input] and set any range there:
To solve that, open the Adjustment scene and edit the 'Character height offset' value:
Don't worry, just email us (firstname.lastname@example.org) and we'll help you 😉