Hello,
Thank you for purchasing our theme and for using our support forum.
1/ Please go to Dashboard > Products > Categories > edit category > add Thumbnail image. Images of categories can’t be imported, so you need to manually add image for every demo category, or delete them and add your own products categories.
2/ Please provide temporary wp-admin access, so we can fix the problem with this static block https://prnt.sc/CTUX7RxW5UV9 on the single product page.
To provide wp-admin access, you can create a new user account with administrator role via the Dashboard, and provide us with the username and password via the Private Content area.
We look forward to your reply.
Kind Regards,
8theme team