I downloaded BB's envirosphere to my desktop - where a folder appeared titled 'runtime'

I consulted the Ref Manual, and opened my wip Poser8 project and clicked the 'Add Library' button at the top right of the Library palette.

When the 'Choose a folder' window opened, I steered to my desktop and clicked on the 'runtime' folder.

A window opened saying 'This does not seem to be a runtime folder - please choose another'

So then I went through the process again, but this time, when the Choose Folder window opened, I opened the runtime folder and selected in turn the folders inside named 'libraries', 'materials', 'props', and 'EnvSphere'. Each evoked the same rejection message.

The manual helpfully mentions that while the library item loading process is automated for PC owners, Mac users can "open and load from their desktop in the normal way"

Huh!?

I hope you can help, hbore :o(  

(I just might have bitten off more than I can chew with this golden statue concept)