Just to clarify this: We have discontinued CHM production due to technical limitations of the third-party, closed-source, deprecated tool required to produce CHM files. Our documentation, as of version 4.16, grew to such a size that it would crash the tool on which every CHM-generation program relies. The TGZ archive contains our API reference in HTML format, so users who want an offline reference can download and extract the reference they need from there, and read it with any web browser. I hope this addresses any remaining concerns.