Update from 3.X (Arvixe)
The update procedure is exactly the same but unless is explicitly mentioned do not change the root .htaccess file. If somehow you replaced this file make sure to have this line of code at the very top of the file:
Code:
AddHandler application/x-httpd-php54 .php54 .php
By the way, check the support hours because we don't have 24/7 support hours.