1st problem: When I activate the plugins YITH WooCommerce Wishlist or
YITH WooCommerce Compare the webpage stops working and displays an error message or simply does not load anything, the only way to return the page is disactivating both plugins.
2nd problem: I can’t import dummy content, if I click in import base data button starts to download data but in 3 or 4% shows a message like ajax error, also in aditional pages tab all content is disabled to import.
2. As we can see, your website is already configured and has some content. That is why we don’t suggest you to import our dummy content since you may lose some configurations.
It seems to be some PHP error in YITH plugins code. It doesn’t depend on our theme and we suggest you to contact plugin developers. They should help you with this issue.