Installing IPAs from the web carries risks. Always ensure you are downloading from a reputable community source, and be aware that many old apps (like Facebook or Twitter) may still fail to log in because their back-end servers no longer support iOS 7's security protocols. 1.2 to this post?
Transfer the IPA file to your device (via SSH or a cloud service). Open the file with a tool like and tap "Install". Using a Computer (Non-Jailbroken) : Connect your device to your computer via USB. ipa files for ios 712