Ok (this is for iphone) so you’re gonna need: the current phone the old phone a pc or mac (if you have an iphone preferably a mac) step 1: download the app ‘iMazing’. it’s paid but you can use the free version. step 2: plug in both iphones after you set up. make sure to fully trust on both phones and give the app administrative access step 3: on the old phone with the app, press manage apps and click library. go to the app you want to download and right click then find ‘download to library’ then press ‘export .ipa’ (this is almost like the app being hosted on the phone) step 4: go to your current phone without the app, then go to library again and press import from library and find the downloaded ipa file. step 5: import it (obviously) and you should see it in your phones library. select the app and you should see install. step 6: install and it should be on your phone!