Sorry to hear of the problem you are having.
I have tested it on my test site and it’s working fine for me using latest version of Jevelin theme.
First of all please make sure you are using latest demo import method as described in the following topic.
If you still face the internal server error then please fix it as described in the following page.
I have done testing and uploding and even getting hosting support to assist. but not working.
this is what hosting team report.
<p class=”p1″>Oh, I see. This is what I found in error_log file: Cannot send session cache limiter – headers already sent (output started at /home/colefvra/tiendasoux.store/wp-includes/cron.php:320) in /home/colefvra/tiendasoux.store/wp-content/plugins/unyson/framework/includes/hooks.php on line 256</p>
In your shared error log i can see the error generated by Unyson plugin.
To resolve the error please try using the solutions shared in the following topics.