So excited that part 5 came out! But I'm on Linux now, and can't play it. Is there any chance of getting a port?
Alternatively, there's mkxp. mkxp is an open source RGSS player for Windows, OSX, and Linux (the main focus) for games built in RPG Maker XP, VX, and VX Ace. Games without extensive custom scripting such as the Treat series will work out of the box with the prebuilt binaries available for download.