It's hard to tell where is the problem, probably some links are wrong and lead to the previous site, otherwise if you did not do any changes with the features that are lacking in Standard version (i.e. Helpdesk and Forum) there shouldn't be any problems. Please send a ticket at
https://www.viart.com/support.php with your admin and FTP details and our support team will help you.
Regards,
ViArt Support