Hello @AgroTeraria,
Based on the error log we reviewed on your server, it appears that some files were not loaded correctly during the theme archive upload process. We have manually added the missing file “xstore/framework/customizer/theme-options/speed-optimization/speed-optimization.php,” and as a result, the fatal errors on your website have been resolved.
Additionally, we corrected your wp-config file, as some of your customizations were placed in incorrect locations, which caused the notices (https://prnt.sc/eTLyJoG9Swju).
You can now proceed with the demo import process. If you have any further questions, please feel free to submit a support request, and we will be happy to assist you.
You may also find the following articles helpful for the demo import process:
1. https://www.8theme.com/documentation/xstore/theme-installation/xstore-setup-wizard/ (Step 4 and subsequent steps)
2. https://www.8theme.com/documentation/xstore/theme-installation/demo-content/
Best regards,
Jack Richardson
The 8Theme Team