Hi @efishinsea ,
Type and open "Turn Windows features on or off" in the windows search box, and check whether related features (such as CGI/FastCGI) are checked in Internet Information Services/World Wide Web Services/Application Development Features
. If it appears to be enabled, but doesn't really work, maybe some files were corrupted while updating the windows system, running the SFC tool can help, after running this tool you have to uninstall CGI and reinstall it. It will bring back the CGI and FastCGI modules in IIS Manager.
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Best regards,
Yurong Dai