The Omni Group:
With the original download free, we can implement any pricing options we want to offer customers through In-App Purchases. We can offer our standard unlocks of Standard and Pro, of course. But we can also offer a free 2-week trial which unlocks all of the features of Pro and Standard, letting you freely choose between them. We can offer a discounted upgrade to the new Standard. And we can offer free upgrades to the new versions to any customers who recently purchased the old app.”
Great start to a really tough problem. This seems like the best possible solution for them. Love it.