Yeah, it does kinda defeat the purpose. Looking around
, it looks like sourceforge has the most up-to-date source code, but they don't get around to uploading the compiled versions there for some reason. It might also be that there seems to be a new version of vgmstream every 5 days or so, so keeping it perfectly up to date in Chipamp forever probably won't be possible. But its revisions usually only fix one or two specific files or formats, so being a little out of date isn't usually that big of an issue.