Asset dependencies
Post Processing Stack v2
Asset uses Post Processing Stack v2 for better graphics, so if you don’t add it in Package Manager, it will not work.
To add it from package manager, select in Unity top menu Window > Package Manager. In the opened window proceed the next steps from screenshot:

Text Mesh Pro
Note
This partition is actual from 1.8.0 asset version.
Asset uses Text Mesh Pro for all UI texts. It should be included automatically on asset import. If not - please, add it manually in Package Manager.
Do not forget to import Text Mesh Pro Essentials, if Unity show request window for it.