Hi Austin. I'm Greg, a Volunteer Moderator and 10 years Windows MVP here to help you.
If you bought Minecraft using your Microsoft Account then it should appear when you sign into Windows and the MS Store with the same account then go into Microsoft Store app under Settings (three dots at top right) then Library where there should be an Install button to install it.
If this doesn't work does it show up in your online MS Account Order History?
https://support.microsoft.com/en-us/help/402731...
If further problems contact Microsoft Support at https://support.microsoft.com/help/4051701/glob... or at https://support.microsoft.com/contactus choose Get Help, then Contact Us toward the bottom, then answer Yes you can Sign In, then Select Product: Windows, then tell the Issue, it should offer Messaging and/or a Call Back on week days.
I hope this helps. Feel free to ask any questions. Based on the results you post back I may have other suggestions if necessary.