By “old theme” do you mean another theme, not XStore?
Yes, Old theme is from “EDigitVersion: 1.0 By Templatemela”.
When I imported the demo data the product brands are overwritten by demo content. Is there any way to restore it?
Why it is overwritten by demo content when I have not selected the product while importing the demo data?
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.