I had this problem with RapPro and it was very maddening. in the end Rapture was looking for it's multisamples in a directory one level deeper than it should have been. I simply copied all the multisamples into it.
So, for example, I had RapPro multisamples in: D:/Rapture Pro/Multisamples
RapPro was looking for them in: D:/Rapture Pro/Multisamples/Rapture Pro/Multisamples