If you plan on playing original Silverfall...
MAKE SURE you have BOTH Silverfall (original) + Silverfall: Earth Awakening (stand-alone expansion) and that you do install them TOGETHER right into the same game folder.
Earth Awakening fixes so many technical issues w/ performance improvements; and has a lot of UI and camera fixes and improvements (which is for both games), it ain't even funny.
They (Monte Cristo Game Studios) NEVER patched all of that stuff into the original Silverfall game alone.
You NEED Earth Awakening for all the UI and camera improvements for the Original game!
BTW, RIP, Monte Cristo Game Studios!
If you only install the original Silverfall - you'll be missing out on tons of UI and camera improvements that only Earth Awakening gives you that it ain't even funny....
As someone who played Silverfall (original) before Earth Awakening came out, I'm telling you - the differences and improvements are like day and night here.
Earth Awakening is a stand-alone expansion, so you could always play that alone w/out installing Silverfall (original).
You'd have all of the UI fixes, camera fixes, and all of that stuff - b/c that stuff just comes w/ Earth Awakening period.
EDIT - Nov. 18, 2012:
You can read some of my thoughts that I wrote years ago on Silverfall + Earth Awakening...
Silverfall (original) [before Earth Awakening was released]:
Part 1.
Part 2.
Silverfall: Earth Awakening:
Part 1.
Part 2.