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I purchased the app on iPad, but the App Store wants to charge me again on the Mac. What do I do?
This is a bug on the App Store. It will not charge you a second time. You can read more about the bug here.

I previously bought Patterning 1/2 and it's no longer available, where can I get it?
To download an app no longer for sale, open the App Store, tap your profile picture, select "Apps" (or "Purchased"), and look under the "Not on this iPad" tab to find and re-download it.