Update: Yesterday's Battle.net Update applied a resolution for this issue. Mac 10.6 users should now be able to install Blizzard Games again. Thank you for your patience!
We’re currently aware of an issue that is causing users on Mac OS X 10.6 to be unable to install games. Patching and updating your games should still work as expected; this will only happen with a brand new install. We have a fix for this and we are working on getting it out to you all as soon as possible.
In the interim we ask that you DO NOT uninstall any currently installed games or the Desktop App – doing so will then make you unable to reinstall those products.
Original Message posted here.
Edited by Glaxigrav on 7/16/2014 2:46 PM PDT
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