Meshbox has changed over the years.  The first products I purchased were .3ds format.  Then they went to offering their products with multiple formats.  Mother's House and Aida's Coffee house were free during the old CP Passport and these have the Poser runtime structure as well as vob and opb.  When they began releasing their R2 lines, they began selling the different formats separately so you have to pay attention when ordering which version you are buying.

File a support ticket with CP, explaining the problem.  If you don't get any help from CP then contact Meshbox directly.  Their customer service was good when they were selling directly.  I don't know how it is now that they have broker handling things.