Hey everyone,
Sorry we didn’t post about this here sooner–we thought we had and then when we checked just now realized that we had not. 
BUT the update is to Silo v2.5.4 is now available (and for v2.x license holders, this is another free update) at http://nevercenter.com/silo Just click the “Download” button to snag the latest version.
v2.5.4 is a minor update that adds full support for High-DPI/Retina displays. (See the blog post about the update at http://nevercenter.com/blog/)
Enjoy!