Tried Installing via ant -f install.xml here is my log with a failed build.
check-cache: download_using_get: [get] Getting: http://flex.apache.org/installer/properties/sdk/en_US.properties [get] To: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/en_US.properties get-if-not-cached: [get] Getting: http://flex.apache.org/installer/properties/sdk/en_US.properties [get] To: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/en_US.properties check-params: get-with-no-params: [get] Getting: http://airdownload.adobe.com/air/mac/download/29.0//AdobeAIRSDK.dmg?ts=201805311405 [get] To: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/in/AdobeAIRSDK.dmg [get] http://airdownload.adobe.com/air/mac/download/29.0//AdobeAIRSDK.dmg?ts=201805311405 permanently moved to https://airdownload.adobe.com/air/mac/download/29.0/AdobeAIRSDK.dmg?ts=201805311405 BUILD FAILED /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/installer.xml:351: The following error occurred while executing this line: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/installer.xml:371: The following error occurred while executing this line: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/installer.xml:895: The following error occurred while executing this line: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/installer.xml:920: The following error occurred while executing this line: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/installer.xml:927: The following error occurred while executing this line: /Users/oharkins/Documents/Adobe/ApachieFlex/test/apache-flex-sdk-4.16.1-bin/installer.xml:967: Redirection detected from http to https. Protocol switch unsafe, not allowed. -- Sent from: http://apache-flex-development.2333347.n4.nabble.com/