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This type of issue occur due to ( Server Execution Time ), Current your server Execution Time (30 second ) or less, first you can conform that : here is step to check you server execution time
1. Go to Backed Admin Panel >> WooCommerce >> System Status See the read area in screenshot.
2. If there is only (30 second) then, Please contact you hosting services provider and request to increase execution Time at list 90 Second , after then your have try to import demo data is working fine.
- This reply was modified 3 years ago by Sparkle Themes.