Highend theme installation,

I have installed Highend WP theme and After the installation of the required and recommanded plugins, I have no more access to my WP admin. It says:
“Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.”

You said that you are offering FREE theme installation and demo content import for all your customers.I am interested by this service and I would like the theme to be installed in French.