Vintage runs fine on DS11 for me.  I don't believe it ships with DS11, I don't remember if it shipped with DS8, so I'd copy it over to a different folder along with any other dreams which may have shipped with DS8 so that they don't end up deleted during any install/uninstall process.

I'll also let you know that the "Water" dream is no longer included, it was replaced by "Liquid".  I think it's safe to say "Liquid" is an improvement over "Water"; however, if you purchased the old premium "Liquid" you will want to have that copied over as well, it has a couple of transparency settings which are not included in the shipped "Liquid" and it will be overwritten by the new shipped version during installation.