Hi, I am not sure how the app store works, but you should be able to download whatever you already own. Starlink isn't available for sale on iOS anymore because it was simply not selling enough units per year to warrant the ~$100 fee on iOS and because Apple's dev tools (XCode) and their approval process quite frankly seriously suck. You can still get it on Android, and I can transfer your profile over there even if you never exported it yourself.