How to install TurboTax purchased online from amazon on iPad pro?

You can’t. You need the iOS version, purchased or downloaded from the Apple App Store.

https://apps.apple.com/us/app/turbotax-tax-return-app/id940247939

That version might be for a desktop computer only.

If you mean this iOS app:--> https://apps.apple.com/us/app/turbotax-tax-return-app/id940247939 , download it from AppStore.

Regards

Giulio

Sorry Demo, didn't see your reply in time :(.

Have a great Sunday.

Giulio

No apology necessary, my friend. You have a great one as well.

:)