Hi, @selad.
I’m sorry to hear you’re having difficulty with a Fatal Error when trying to install the plugin on your site that’s on WordPress 5.3. Thanks for getting in touch.
We have already tested all our plugins, including the free ones, on test sites that run on the latest version of WordPress and found they work as expected and are compatible.
Hence, the issue you’re experiencing is likely isolated to your site.
A similar Fatal Error was also being experienced by @sip33, who already has the plugin installed and working on their site prior to updating WordPress. After having done so, the error displayed and the posts table no longer displayed.
As mentioned in their reply (many thanks and well done!), the issue was resolved by updating the PHP version on their site from 5.1 to 7.3. Note that the plugin details show it to be tested for PHP Version 5.3 or higher/newer (PHP 7.3 compatible).
I hope this helps. Please let me know how it goes. I’ll mark this as resolved for now.
Best regards,