500 at theme installation

Dear support,

I bought your template “Enfold”, installed wordpress, logged in, went to theme management and tried to upload your theme. (the correct zip)
But after I do that, I get this message:

Are you sure you want to do this?
Try Again

And when I click yes, nothing happened. So something goes wrong there.
So, I tried option 2. unzip your theme and upload it via FTP into the themes folder.
Low and behold, its not visible in the themes tab.

So than, I resorted to option 3. Go to the editor of the current theme and click in the left sidebar on “Change theme”.
Now I Do see Enfold and I can click Live preview. But once I do that, I get this:

xablu-contracts.gryphoninteractive.nl is currently unable to handle this request.
HTTP ERROR 500

So.. I think its pretty obvious the theme causes a 500 error that causes these 3 issues.
So, I downloaded the error logs from the server and I see this:

[Mon May 01 10:43:51 2017] [error] PHP Parse error: syntax error, unexpected T_FUNCTION in /var/www/vhosts/gryphoninteractive.nl/subdomains/xablu-contracts/httpdocs/wp-content/themes/enfold/config-layerslider/LayerSlider/layerslider.php on line 109, referer: http://xablu-contracts.gryphoninteractive.nl/wp-admin/customize.php?return=%2Fwp-admin%2Ftheme-install.php&theme=twentyfifteen&changeset_uuid=0dca2fc6-88e3-40a5-bb2e-56bb47baa75d

and

[Mon May 01 11:05:11 2017] [error] PHP Warning: POST Content-Length of 12207205 bytes exceeds the limit of 8388608 bytes in Unknown on line 0, referer: http://xablu-contracts.gryphoninteractive.nl/wp-admin/theme-install.php

and

[Mon May 01 11:07:20 2017] [error] PHP Warning: PHP Startup: Unable to load dynamic library ‘.//usr/local/php5.5-fcgi/lib/php/20121212/suhosin.so’ – .//usr/local/php5.5-fcgi/lib/php/20121212/suhosin.so: cannot open shared object file: No such file or directory in Unknown on line 0, referer: http://xablu-contracts.gryphoninteractive.nl/wp-admin/customize.php?theme=twentyseventeen&return=%2Fwp-admin%2Ftheme-install.php

So, can you tell me what to do? Because Im looking at a error and 2 warnings.