If you are currently using OP2 and want to transition to the newer OptimizePress 3.0, we actually built the new OP3 so you can use it alongside OP2 on the same site. They will not cause issues with each other (they are like siblings actually).
Just know that it is not possible to edit OP2 pages with OP3, and of course editing OP3 pages with OP2 would not be possible. They are each their own completely separate systems.
If you have any further questions about OP2 vs OP3 please contact our support team and we’ll be happy to answer those for you.