Make sure you have checked all the server requirements before the installation – https://xstore.helpscoutdocs.com/article/60-xstore-theme-requirements
Seems that you did not install theme correctly because some files are missing. Did you install theme via Dashboard or via FTP? Try to remove theme and install it via Dashboard (Appearance > Themes > upload) again. Let me know about results with activation after that.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.