For this problem, if you want to use Joomla 3, please make sure that your server supports it.
Actually this is not problem about template but the server configuration. It need to meet Joomla requirements then you can install it.
I already have several Joomla 3.X installed on this server.
On your installation file, you did write :
"Please make sure your server supports MySQLi Database. And if you're unsuccessful following the steps above, you could please PM me, I will send you the website files and SQL separately".
Waiting for an issue before you will be in holidays tomorrow or I will ask for refund.