the mimetype extensions has-been removed from PHP 5.3.0 and you are using 5.3.27
and php on your server is Already complied With the option "with-mime-magic"
You need to proceed with installation if getting any errors and then consult with vendor script.
If They suggest to manually install any module then you will need to ask your system administrator installations as third party support is out of our scope.
Hi Hugo,
Sorry for the inconvenience,
I have noticed this problem as you have posted previously.
Actually our support guy who is concern about your issue is in vacation.
I have informed to our support manager to take required action.
Hope he will assist another guy for you.
Thanks