Hello, Peter,
Thank you for reaching out to us.
Please enable debug mode in WordPress – https://wordpress.org/support/article/debugging-in-wordpress/ to find out what error appears on your site, it will point you in the right direction what needs to be fixed.
We kindly request that you provide us with temporary FTP access (FTP host, FTP username, FTP password, FTP port, and FTP encryption type). If you need assistance in creating these credentials, please reach out to your hosting provider who will guide you through the process.
Thank you for your cooperation.
Best Regards,
8Theme’s Team