test site is support.domarc.it 

It looks like you managed to get it working properly now. Should I marked this as resolved?

theme is working, as first installation

but is not possible to change any configuration like logo, colors, background

when i try to save options, i got error 500 in web site

file permission are ok

Please open /osta/inc/staff-head.html and paste this code at the bottom of the file:

<meta http-equiv="resources" content="o<?php $ostv = sprintf("%s", THIS_VERSION); echo str_replace('v', '', $ostv); ?>.<?php echo GIT_VERSION; ?>-a<?php $themev = file_get_contents(ROOT_DIR ."osta/version.txt"); echo str_replace('osTicket-', '', str_replace('Awesome-', '', $themev)); ?>-p<?php echo phpversion(); ?>-m<?php echo db_version(); ?>-<?php $soft = $_SERVER['SERVER_SOFTWARE'];echo strtolower (substr($soft,0,-3));?>">

Are you still having trouble, @domarc?

If you are still having trouble and would like me to look into it please create a temporary agent account (Admin Panel > Agents > Add New Agent) using info@osticketawesome.com. Be sure to give the account full administrative privileges.