I'm installing the stable build for use on a SX40 and copying the files from the zip to the root of the SD card using a Mac, both in Finder and also tried on command line.
When booting the camera and going into the menus, there is no upgrade firmware option.
However, when using Windows and doing exactly the same workflow, there is the option to upgrade...
What is special about the Mac that maybe causing the issue??
I'm aware that there are a couple of installers available, e.g. Sticks, however I'm no happy installing java so am reluctant to use them.