Red Viper is 赤まむし at the Japanese Pixiv website.  Hope you can read the Japanese words for his nick I just provided. 

Some of his ( rather nice ) freebie dress sets for Poser use with Aiko4, are time-limited and may not be available - but he writes that people may contact him directly to ask.

The password for each of his zipped archives, is included in the text above each sample render for his freebies, in his gallery.  You need to be a member of the Japanese Pixiv website to access his freebies.

That's about all the information I can provide.

Eternal Hobbyist