Thanks. What I got at those two web addresses was:-

https://www.renderosity.com/rr/mod/bcs/index.php?ViewProduct=87216&&

This caused a fault remark "Your search - https://www.renderosity.com/rr/mod/bcs/index.php?ViewProduct=87216&& - did not match any documents.".

https://www.renderosity.com/rr/mod/bcs/index.php?ViewProduct=65325&&

This found a model called "Swidhelm's Skywyrm". It seems that setting its wing membranes needs the Cloth Room, which is something that I am not accustomed to. How could I set its wing membranes to fit at any random pose, not only the 6 poses that come with it?