I'm trying to prepare to upgrade from Membership Pro to Membership2 Pro. The instructions tell me to update my Membership Pro to 18.104.22.168 before updating. I am unable to do this. I'm currently at 22.214.171.124. Trying to update from the plugin or from the WPMU Dev dashboard gives me a 404 error. How can I update Membership Pro before upgrading to Membership2 Pro?