Demo Content Not Importing
If demo content fails to import, try the following:
Increase PHP Memory Limit : Some servers may have a low memory limit that affects importing demo content. Increase the memory_limit in your php.ini file.

Deactivate Other Plugins : Some plugins may interfere with the import process. Temporarily deactivate other plugins and try again.
Import Using Smaller Files : Try importing demo content in smaller batches, especially if the demo content file is large.
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