I recently noticed that the late great Aaron Allston's classic Hero campaign source book, Mythic Greece: The Age of Heroes, is now for sale in PDF form from the Hero Games website store. That book was written for first-edition Fantasy Hero, before all the different iterations of Hero System were unified in Fourth Edition. However, Aaron himself created a document covering not only errata for the book, but Fourth Edition updates to a great many elements from the book: character templates (including the "basic god"), combat maneuvers, weapon and equipment game stats, and Powers as magic spells (but not the specific spells from the book). These conversions would make using Mythic Greece with any later edition of Hero much easier.
Aaron provided this file for free, both on the classic Red October BBS and on his personal website. Hence I have no hesitation to post it again here.