This is where the "iOS 7 IPA archive" comes in. It's more than just a dusty collection of files; it's a digital preservation effort, a time capsule, and a community-driven project to ensure that the apps of this transformative era are not lost forever.
: If your device is jailbroken , installing this tweak from Karen's Repo allows you to install IPAs permanently without needing to sign them with an Apple ID. 3. Step-by-Step Installation (Sideloadly) ios 7 ipa archive
If you're looking for alternative solutions, consider the following: This is where the "iOS 7 IPA archive" comes in