Hi Dany, I think that you must allow unsigned apps (in Security & Privacy pane of the System preferences) in order to install it.
In recent versions of OS X, this became a blocking error instead of a warning by default. This preference setting allows to revert it to a warning, non-blocking message. -- Cosma 2014/1/20 Dany Dhondt <archeme...@mac.com> > Hi, > > I tried to install the SDK installer but get an error. When trying to > launch the installer I get an error saying 'Install Apache Flex installer > is from an unknown developer and can't be installed' > I read the wiki but found nothing related to this. > > My system: Mac OS 10.9 > > Any thoughts? > > Sincerely, > > Dany Dhondt
