For chapters 2-6 just get the zip file under download and extract everything. EasyRPG is already included, so you only need to find " player.exe" in the main folder, and open it to start the game.
For chapter 1 download from under "the new update" and extract. This time there is no player, but you can simply copy "player.exe" from the previous part, and paste it into the main folder and use that to play.
At least that worked for me. Hope this helps.