PHP script 'C:\wwwroot\zf.tuyang.online\index.php' is protected by SourceGuardian and requires a SourceGuardian loader 'ixed.8.1.win' to be installed.

1) Download the required loader 'ixed.8.1.win' from the SourceGuardian site: https://www.sourceguardian.com/loaders/download.php?php_v=8.1.29&php_ts=0&php_is=8&os_s=Windows+NT&os_r=10.0&os_m=AMD64
2) Install the loader to ext
3) Edit C:\BtSoft\php\81\php.ini and add 'extension=ixed.8.1.win' directive