If you’ve sideloaded Instagram on your Z10, DO NOT LOG OUT from the account. A lots of users reported that if you sign out from Instagram, most probably you can’t sign in again. By uninstalling and re-sideloaded the app also no luck.
The error states :
“Your version of Instagram is out of date. Please upgrade your app in the Play Store to log in to Instagram.”
Till to date, no users can come out with a solution to this issue. As this is sideloaded app, it’s won’t be supported by Instagram.
Source : CrackBerry