Make sure you have checked all the server requirements before the installation – https://xstore.helpscoutdocs.com/article/60-xstore-theme-requirements
You can import settings of the demo version manually:
– Download “XStore import files” from this page https://www.8theme.com/downloads/ and find “organic02” folder > options.json.
– Go to Theme Options > Import / Export > Import Options > add the content of the options.json and click on Import. Re-save Theme Options.
If this doesn’t help, provide us with temporary wp-admin access.