rpg maker games can be built as a standalone game with the runtime package (rtp) included, OR the rtp can be downloaded separately from the rpg maker site, allowing any rpg maker game (of the vx ace version, in this case) to be run just by downloading the unique files for that project. the download size is significantly smaller in the no rtp version, and considering this game has 6 parts now, you don't really need so many repeat files, that's why i offer it, haha. (...though it seems like most people just grab the standalone version and don't really care!)
i hope i explained that in a way that is easy to understand lol