How to Sycn in outdated version of the game

How to Sycn in Outdated Version.
Helping a friend

update the game throught Playstore or Appstore

If your app is updated already in the current version, you can just use Shareit to help your friend update his/her app without going to pPlaystore/iOs

But when i go to appstore it says that open not update?

If you did not install the game from the app store the first time (if you got dungeon quest from a website or sideloaded it to you device) then it will not update from the app store.