This is the server error log entry from the time of the internal server 500 error:
PHP Fatal error: require_once(): Failed opening required ‘D:\Inetpub\vhosts\dpi.gov.gy\httpdocs\wp-content\plugins\jetpack/_inc/lib/class.media.php’ (include_path=’.;.\includes;.\pear’) in D:\Inetpub\vhosts\dpi.gov.gy\httpdocs\wp-content\plugins\jetpack\class.jetpack.php on line 25