Well, I am (obviously) Russian-speaking.
Buran.ru is an active and constantly updated site. There is no any announcement about technical problems or limitations of access. The page with models claims, that the models are for some graphical packet bCAD v.3.5. The link to freeware demo-version of this packet is located in the beginning of the page, the link to the site of its developer ?€“ in the end. Demo-version is said to be able to convert the models in other formats. In short, ElecMoHwk understood everything correctly.
If you are interested, there is also a recently finished 3D screensaver with Buran :
http://www.buran.ru/htm/scr.htm (11.5 Mb). I didn?€™t try to test anything of this.