There is currently only one VB importer in the member area and it is for 3.8.
However that does not mean it will not work.
Since we don't know what the changes are from vb3.8 to 4.

If the db was not altered then possibly it may still work.

An X.xx to a Y.xx? Oooh I wouldn't think so.

...but then that's what things like xampp are for

Never said it would work.
But what little I know about VB is that it changed the css styles but little else on v4.
So the import may work but you may still have some issues.
I have no clue where they store the styles at.

has anyone have try it ?

no.. it won't work

vb4 is a totally different beast vs 3.8

What would it take to get this to work? Is this in the plans for someone to do this? Being that VB is one of your most direct competitors, I would have thought the conversion tool would be out right after the 4 release?

I'm pretty sure importers will be on hold till 7.6 is done. As the change logs show, 7.6 itself has a tone of code changes and importers would need a whole new rewrite as well.

+1

correct