AFAIK, Style has nothing to do with Mold Design functionality. It's actually, like the name implies, a styling feature mainly for industrial design. Of course it can be used for some complex stuff in molds, as it can be used for more complex stuff in anything else.

That said, unless the package you bought includes ISDX, you will need it for STYLE to be available..

If you already have ISDX, it may be associated with a different Foundation package or there was a mistake when generating your license.

HIH

Rui