Hello,
Thank you so much purchasing our theme and contacting our support center.
500 error code says about some internal server error. Could you please ask your server providers why it doesn’t work and what this error is caused by? We understand that it happens with our theme only but it may be caused by a lot of reasons like memory limit, PHP errors, additional plugins incompatibility, PHP version and so on. Please, contact your hosting providers for help and back to us when you will have some details about this error.
Kind Regards
XTemos Studio