So ironically enough, I had issues downloading my own app (which you can download here!)
Luckily, with the powers of the internet and my fellow Evangelist David Washington (thanks David!) I was able to resolve the issue.
Try any/all of the tips below if you experience the same issue:
Try this to fix your download issue:
1) Go to start
2) Type “wsreset” hit enter
3) Try to launch
That deletes the store caches.
If that doesn’t work try this:
1) Launch store
2) Go to settings charm
3) Click app updates
4) Click “sync licenses” button
If that doesn’t work try reboot then try again!
These forums are also helpful:
Feel free to let me know how this works for you. I'd be interested to learn other ways to fix this issue. That being said, these fixes worked for me :)