mobile App stores allow you to reinstall purchased Apps. HOWEVER - You can't move to another OS without purchasing the App separately for that platform. See why here . For FL Studio Mobile Android:
Please check the Google Play Store ...
If your FL Studio Groove App in the Windows Store has not automatically updated, you can manually do so as follows:
1. Go to the Windows Store.
2. Click on ‘ Account ’ (top of the screen)
3. Click ...