I don't know from MACs, but in several browsers, you can right-click on the icon of what you want, and select 'save target as'..which works for me. I also think some of the later .3ds or .lwo might be incompatible with Bryce, but haven't played with them enough to be sure..

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)