Hello HMorton

Here is a direct link to the test builds download https://download.blender.org/release/Blender2.72/ as a bit of advice downlad the zip file and run Blender from within the folder so it si seprate from your installed version they can both run on the same Machine but if you install it using the exe file since it is still in a beta testing you dont want any potential bugs cuasing an issue with the stable installed version. I tend to run test builds from the folder to get a feel for it

Good luck

Lobo3433

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Subject: how do you blend your pixels ??