Some iOS Snapchat users report they can get the "old" version of Snapchat back and installed on their iPhone or iPad. This is known as the "forgot password" crack.
1. Delete Snapchat on your iPhone.
2. Disable automatic updates on your iPhone iTunes & App Stores -> Updates Off.
3. Download Snapchat from the App store and install it again.
4. Open Snapchat and choose forgot password. Choose reset by phone, get code, then change your password.
5. Finally, log back into the Snapchat app with your updated password. It will be the old version of the Snapchat app.