After you install the game go to the games base directory,(I.E C:\games\[RpgMakeGame]RPG Maker MV Is it possible to add downloaded RPGM games for translation?
If so, how can I use RPG Maker MV to load my downloaded RPGM game?
in that directory is a folder named www. This is the project files for the game. Copy it to wherever you keep your rpgmv projects and rename it from www to [someProjectName]. Then copy the file "Game.rpgproject" from any project you made from scratch in rpgmaker to the newly renamed folder. Once that done it should open just like any other project from inside rpgmaker, or by double clicking the Game.rpgproject file.