accithanos Hi. I can see that Your installation is not correct. I think it may be because of low PHP version or/and too high restrictions on database. I would suggest updating PHP and disabling showing errors in php.ini
Currently Jomsocial registration is stuck on database update since there is a warning message showing in backend making it impossible for installation to proceed. I've forced it, but it most probably means that database is not updated correctly, so please try adjust server according to my suggestion and than try install jomsocial again.