Installation on Mac OS X
From OHRRPGCE-Wiki
See also: Installation on Windows
Get the OHRRPGCE from the Downloads page, or get it here: http://HamsterRepublic.com/dl/OHRRPGCE.dmg
Save it to your hard drive, and then double click it to mount it.
Copy OHRRPGCE-Game and OHRRPGCE-Custom to your hard drive