Just got my blog back

Hello -

Is there a particular way to move from supporter of yore to the new Pro-sites.

When I tried to install prosites and activate it, I got this error:

Fatal error: Cannot redeclare is_supporter() (previously declared in /var/www/vhosts/oxenmine.com/httpdocs/poorgradpoorstudent.com/wp-content/mu-plugins/supporter-framework.php:351) in /var/www/vhosts/oxenmine.com/httpdocs/poorgradpoorstudent.com/wp-content/plugins/pro-sites/pro-sites.php on line 3367

So I went and deleted all supporter files and ofcourse the folder.

Stupid thing died.

Had to back up with a year old backup.

HELP please - how can I get rid of supporter and get ProSites instead?