Ok it is finally available for vB4.2, just grab the latest version from your customer area, 1.2.0 and the files are in a zip vBNavTabs For vB 4.2 ONLY!!!.zip
Hmmm maybe for some reason it don't like zips inside of zips. If I see this as a issue I may just put it in a folder instead of a zip, but the reason I did that is so users have a better chance of knowing it is different.