500 Internal Server Error

Known reasons for this error are:

1) .NET 4.8 is required but has not been installed. See solution here.

2) The web.config file in the installation directory does not exist or has been saved as some other file type than .config, e.g. .txt. Check the file properties of the web.config file.

3) The web.config file in the installation directory contains incorrectly formatted xml. Check the xml formatting of your web.config file.