This might not be the help you want, but it's the help you need: if this (https://www.orbiter-forum.com/resources/buran3-03beta.3288/) is the addon you are talking about, then you have to realize that it was made in 2004, way before Orbiter 2010 was even dreamed of, so you cannot expect it to work there. Some addons will work in other Orbiter versions, but others will not. This addon should work in Orbiter 2003, or whatever version was out at the time, because it was what the author had to work with.