Avant Browser 2013 has recently received several new enhancements, most of which are supposed to improve the overall performance of the app, while also fixing some bugs.
Basically, build 108 updates the Firefox engine to version 21.0.1.4917 and the Chrome engine to 27.0.1453.110, so a much more stable experience should now be provided regardless of the Windows version you are running.
In addition, the new release addresses a long list of bugs, including those affecting the toolbar locking options, Unicode URLS, the favicon and URL position on the address bar and the way images are saved with the Chrome engine.
Just like the previous versions, it works on all Windows versions that are still supported by Microsoft, be they 32 or 64 bit.