error updating my license

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I have an error updating my license at: http://mydomain.com/cast/licenseupdate.php

Product name:
Centova Cast

Product version:
2

I need help please.
I have this error:

Internal Server Error

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

Please contact the server administrator, webmaster@radiohosting.com.mx 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.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Apache/2.2.24 (Unix) mod_ssl/2.2.24 OpenSSL/1.0.0-fips mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at radiohosting.com.mx Port 80

My license urgently need updating.