Even today official installer does not work... For me solution was pol2095's answer here: https://forum.starling-framework.org/topic/feathers-sdk-installer-error-1000-air-25
"I have compiled Windows Source : apache-flex-sdk-installer-3.2.0-src.zip with 64 bit AIR 25 SDK & Compiler Beta – Captive apps only (Windows) You can download a Flex installer that install Apache Flex with Air 25 on Windows 64 bit at InstallApacheFlex_Windows_x64_Beta.zip" -- View this message in context: http://apache-flex-development.2333347.n4.nabble.com/FlexSDK-4-16-0-installer-errors-tp60542p63961.html Sent from the Apache Flex Development mailing list archive at Nabble.com.