Issue with 1.12.0 for macOS and not being able to find arm-none-eabi-gcc
I don't know if it helps but here's the error message I got when installing the update from Eclipse on OSX:
Failed to extract /Applications/SystemWorkbench.app/Contents/Eclipse/plugins/fr.ac6.mcu.externaltools.arm-none.macos64_1.12.0.201611241417/tools/gcc-arm-none-eabi-5_4-2016q2-20160622-mac.tar.bz2 to /Applications/SystemWorkbench.app/Contents/Eclipse/plugins/fr.ac6.mcu.externaltools.arm-none.macos64_1.12.0.201611241417/tools/compiler (tar returned '1')
java.lang.Throwable
David