Upgrading from old version of Membership Pro to Membership Pro 2

Hi,

I have membership premium 3.5.1.5 and while I have members, none are showing under the member list. My members are being locked out of content, as well. Under Options I checked “verify membership tables” everything came out okay. So I figured the problem is that I’ve got to upgrade to Membership Pro 2. So I paid the $19, but now it’s saying I can only upgrade if I had membership 3.5.3.3. So what do I do about this problem? It’s pressing! Thanks