As stated above. The file I supplied when applied correctly works perfectly. I’m more than happy to help but cannot do so without temporary administrative and FTP access to your site.
Times I do get to ‘play’, get server problems so have to deal with those too.
Exactly why kiwitrees.net hosting was established. We manage all such issues, including software updates, and ensure the server is optimised specifically for kiwitrees use. Your primary interest, I am sure, is family history. You should not need to also become a web server expert just to achieve that.