Tutorial by SurplusCameraGear.com.
HTTrack is an application for downloading entire websites, including subpages. The application can save a browsable copy of a website as it was at the time of download.
Additional software is necessary for installing the application on MAC OS. The additional software can be found at the application download page.
Installation manual from CDMM: HTTrack installation manual
Supplementary video tutorial for MAC users: https://www.youtube.com/watch?v=_wLbEgxgBkU
Tips for new users: HTTrack basic tips