good morning
the template is out of date unfortunately the weather34 API was updated a while ago , this may be causing you the issue of Nag screen as the string is no longer present. 3 ways to resolve
1.send me your livedata.php file via email !! I can simply edit it to remove the nag screen.
2.send me your FTP details I can edit the file directly and remove other areas where nag screen may appear.
3.install latest version of template
https://weather34.com/homeweatherstation/ which is you send FTP login in details I can upgrade it in a matter of minutes safely preserving your history data .
ps I dont come on this forum much better to find me over at if you want reasonably quick responses
https://forum.meteohub.de/viewtopic.php?f=56&t=15243&start=375Brian