Calculator 2 is a new paid application whereas MyScript Calculator was a free app with an in-app purchase.
Therefore, it is not possible to get Calculator 2 for free, even if you have already bought the PowerPack in-app.
However, if you use the same iTunes account used for the purchase of the MyScript Calculator Powerpack, you can restore MyScript Calculator full version. To do so:
- Open the AppStore app.
- Tap the Profile icon (iOS 11).
- Tap Purchased item.
- Search MyScript.
- Download and open MyScript Calculator.
- Open Powerpack menu and choose Restore.
Calculator 2 is a new paid app, there is no way to try it without buying it. On the AppStore, you can ask for a refund by reporting a problem : https://support.apple.com/en-us/HT204084. We cannot make any refund on our side.