Hey guys!

I got the offline editor working again by following these steps.

Step 1: Uninstall both Adobe Air and Scratch 2 Offline Editor.

Step 2: Go to this page and scroll to optional downloads. There is a link for Adobe Air 2.6.0, download and install that.

Step 3: Right under the air install link mentioned above is a link to download the scratch installer. Click that. Hopefully this works!

My system:
Macbook Pro Intel Core 2 Duo. 2006 or 2007, not sure.
OSX Mountain Lion 10.8.5

Best of luck!
-Dsteenson