Internal Server Error

Hello, I have problem with Mystique 3.3.2 theme downloaded from official website http://digitalnature.eu/themes/mystique/

I followed this tips but it dont help https://ww.wp.xz.cn/support/topic/500-internal-server-error-156

I regenerated .htaccess

It works well on my main site http://patwist.com but theme dont work on subdomains and i dont know why, other themes work

Please how to solve this problem? Or give me a tip to similar theme