Lost my app when update my windows

Hi i am working on application it very mice app but after 3 months i lost it for update my OS windows then looking for it i not found how i can install agine

1.] Re-download the BSS app

2.] Retrieve your license key if you don’t have it.

3.] You may also need to do some device managing if you did not before

4.] If all else fails contact support.