[Zubersoft]

You can look up the purchase this way:

1) Load the Microsoft Store application
2) Tap the profile icon at the top right
3) Tap Manage account and devices
4) Scroll down and select "Order History" to expand it, and tap "View order history"
5) Change the dropdown on the right to "All available" To see all purchases.
6) Scroll down and find MobileSheets in the list

The FastSpring version refers to the version of MobileSheets that I sell through my own store here: https://zubersoft.onfastspring.com/

It uses a license key instead of an account and updates are provided directly from my server.

Mike