well, from what I understand, programming in OS9 is a completely different beast all together. And home users that are still using OS9 should really upgrade their machines to support OS X. Almost every major software company (including Apple) has already dropped support for OS9. I don’t think it would make a lot of sense for an OS9 version of Avast to be developed since OS9 is past it’s end-of-life. Classic did very well for Apple for a long time, but its time to move on.