Welcome to the community @RonKhoury 
I’d recommend using the automatic backups to restore the original version of the theme you purchased:
I’m sure you’ve already checked it out, but the Webflow University is a great resource if you’re just starting out with the platform with tons of free videos and documentation. If you run into something you can’t figure out with the provided help content — like your question about reverting a purchased theme — then we’re always here to help in the forums!
Hopefully that helps and happy Webflow-ing 