Downloading wallet from app store is totally not safe because you can mistakenly download a fake wallet. Using the official website for any wallet to download will be better. Like electrum wallet the official site is electrum.org which you can download electrum wallet from. It sopport computer, Android and
iOS.
Follow the quote to know how to download and verify electrum wallet.
The latest one is 4.0.9. Make sure to download it from
here and
verify the installation file. Your wallet should open without any problems since wallet files are not removed during updates or uninstallation. Do you have your recovery seed just in case?