I note on your release notes for V3619 that there is a new installer for Linux and OSX.
I am informed by V3522 that a new version is available, so downloaded it. I am then prompted to Install the new version. XDK then closes, but the new version never installs.
On opening XDK, the version is still V3522.
Had to download from your site and install manually to get V3619 installed.
For more complete information about compiler optimizations, see our Optimization Notice.