How to use a Theme from FG Forge?

The Video say to open FG and Choose your rule set and use the theme, but the theme I got is not showing up. So am I missing a step somewhere? Trying to load a theme for Cyberpunk RED and the theme is Cyberpunk RED - Dark Theme threw FG Forge but the only thing listed is FG Dark and FG Light.

Neverminded I sorted it out just needed to get my head space anf timing set right. I updated wondering if that would help and it did.

Indeed. The update button doesn't light up if you have a forge item that requires updating. However after a purchase of anything you always need to update t install whatever it is you have bought.