Which Infuse do I have

If you have Infuse 7 Pro, you no longer need 5 unless you’ve got some really old Apple Hardware that 7 won’t run on.

Infuse 7 Pro gets you all updates forever, as long as you have a subscription. This includes future updates to Infuse 8 Pro, Infuse 9 Pro, Infuse 35 Pro, etc.

When you look at your subscriptions in the App Store it will tell you if you have a Pro or Lifetime subscription to either/both.

Upgrading from earlier versions is explained here.