Readme.rtf says "Copy quickchm.qlgenerator to /System/Library/QuickLook", but this is wrong. Users should never install anything into /System/Library, because the next OS upgrade, even an incremental one, may replace that entire directory. It should instead say "Copy quickchm.qlgenerator to ~/Library/QuickLook/ (to install for the current user only) or to /Library/Quicklook/ (to install for all users)". Note also the trailing "/" characters at the end of the directory names.
These instructions are not helpful anyway, for anyone who is not a Mac OS X application developer, since the qlgenerator is distributed as source, and it includes no instructions for how to compile it. I eventually just gave up, since it always dies with a "doesn't support any of quickchm.qlgenerator's architectures" error. Even experienced nx developers who are also experienced Mac uses, but not experienced Mac developers, won't necessarily know what Mac compiling issues need or mean, while average users don't know anything about compiling anything at all. Why not just include the qlgenerator, and let people download the source version if they want to play with it?