hope you dont take it as spam too much, since it is a little spam:)
anyways, skySystem2 is available under
http://shop.earthcontrol.de/ for
only 10€since i didnt get any problems reported from the customers so far i guess there wasnt any so far;)
the different clouds use shaders from version 1.1 to version 2.0 so there should be one for everyone. no ffp-version , no fallbacks since you shouldnt initiate the skySystem2 if there is no shadersupport - check "d3d_shaderversion" in the manual for doing this
some screens (the parameters are included in the sky_settings.wdl) :

regards, your bandwidthKiller