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The last release of vistapro was version 4.2.7 in 2005. All e-commerce channels for purchasing 4.2.x are dead, so I guess it could be added if found.
I did find a demo version of 4.2.4, and it isn't much different from 4.00, featuring "web integration" with links to vistapro forums. It does add a few other features, including the ability to render 2048x1536 images.
It is still not multithreaded though.