The installer seems to be working for 4.13 but when I try 4.12 it aborts. It seems like it is having trouble find AIR 15. I've copied the log here.
Version 3.1.0 (mac) Using Locale: en_US Fetched the SDK download mirror URL from the CGI. AIR version 15.0 Flash Player version 15.0 Creating Apache Flex home Creating temporary directory Downloading Apache Flex SDK from: http://archive.apache.org/dist/flex/4.12.1/binaries/apache-flex-sdk-4.12.1-bin.tar.gz Verifying Apache Flex SDK MD5 Signature The Apache Flex SDK MD5 Signature of the downloaded files matches the reference. The file is valid. Uncompressing: /Applications/Adobe Flash Builder 4.7/sdks/4.12.1_AIR_15/temp/apache-flex-sdk-4.12.1-bin.tar.gz Finished uncompressing: /Applications/Adobe Flash Builder 4.7/sdks/4.12.1_AIR_15/temp/apache-flex-sdk-4.12.1-bin.tar.gz Downloading Adobe AIR Runtime Kit for Mac from: <path id="air.sdk.path.mac.15.0"> http://airdownload.adobe.com/air/mac/download/15.0/</path> <path id="air.sdk.path.mac.15.0b"> http://labsdownload.adobe.com/pub/labs/flashruntimes/air/</path><file id="air.sdk.file.mac.15.0">AdobeAIRSDK.tbz2</file> <file id="air.sdk.file.mac.15.0b">air15_sdk_sa_mac.tbz2</file> Installation aborted