Personally, I would strongly suggest against installing Silverwings, especially with UT, I'm pretty sure that there is no uninstall and Bill states quite strongly to backup your original textures. Silver wings looks pretty darn good!........as long as you stay in the area that it's intended for, which could work for where you live in central Canada (theres a joke in there :o but I must resist!! ::)) Also SW stops looking after about 3000ft then it starts to look like a patchwork quilt......with a re-occuring pattern

I use Ground Environment and it is a great improvement over default but if I had it to do over again I would strongly suggest VOZ textures....they are for New Zeland and Australia but they can be used globally.......they look
awesome ..........and they are
free 8-)
have a look http://www.vistaoz.org/media.html