Shattered Pixel Dungeon...

The one that is in the discover store is version 3.1.0 but the latest version is 3.1.1 Now I downloaded a copy of the 3.1.1 but I can't find the files of 3.1.0 so that I can fully replace the older version and the Discover app has not updated its version...
Please tell me how to fix this because I am a complete Linux noob...