I've tried online services and most do the conversion and email you a link to download the file but of course you have to pay and/or create an account etc. I'm also a bit skeptical about downloading a program just to convert 2 files, given that most still need an account or are rammed with malware.
Plus let's remember I'm a OS X idiot

From some skim reading I've gathered that there's a way to convert .chm in Windows without the need to extra software or something, but of course I don't really know the details.
Anyway, neither are viewable with Adobe Reader and while there are viewers in the Mac App Store I'd rather have them as .pdf so I don't need viewers on all my devices (both iOS and Android = effort). Especially when its just for these two files.
Can anyone help?
If it makes a difference at all the .chm is around 22mb and the .djvu 89mb.
Alternatively if anyone can locate the files in .pdf we can take it to PM.