EazyDraw provides full support for Mavericks, Mac OS X version 10.9.
EazyDraw 6.3.1 (and 6.4.1 - App Store version) runs on Mavericks and Mountain Lion.
EazyDraw version 6.0.6 supports Snow Leopard (OS X 10.6) and Lion (OS X 10.7).
EazyDraw version 6.0.3 (Retro Version) runs on OS X 10.4.3 and newer ( up to and including Mavericks).
EazyDraw Retro is needed for PICT support.
One purchase, all versions. Only one purchase ( a version 6 license code) allows you to use any of the above solutions. You will be able to use EazyDraw on all Mac computers, even if you have some on older or newer versions of the operating system.