DrowsySam updated Ultimate Test Terrain with a new update entry: 0.10 Fix Read the rest of this update entry...
It should still work fine. Maps usually don't get broken by updates like vehicle mods do. Of course, they won't have some of the newer features, like multiple spawn points, but they should still load up and run fine.
A few posts above you, it says "0.10 fix" meaning it has been updated for the newest version of this game.