Did you put it into cloud? that is usually the problem
Viewing post in [RPG] GROVE: "Dark Places" (v0.308) comments
Wherever you've downloaded the game to and are trying to run it from, it's in a read-only location.
You need to move the game folder to another location. Make sure you've properly unarchived the game, and then move the game files again, using Finder, to the Applications folder.
...it's not a 100% guarantee though since some of the latest OS updates for Mac have caused some problems we can't entirely account for.