A new version of Blender came out last week; 2.73a. Click for: Download Blender and changes overview.
This download is a 90mb file. I use the ZIP version of the install as it operates as a standalone version. That allows me to have multiple versions installed at the same time.
AvaStar will need to be updated to the latest update (avastar-1.3-18_blender-2-70) to work with Blender 2.73a.