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I downloaded the SDK toolkit from here http://sdktools.s3.amazonaws.com/TD_RF_ ... v4.0.0.zip
Imported the files from GIT, like in the instructions, but I can't to install the "GNU ARM C/C++ Cross Development Tools", I'm getting this error:

Missing requirement: GNU ARM C/C++ Core 2.9.1.201508011813 (ilg.gnuarmeclipse.core 2.9.1.201508011813) requires 'bundle org.eclipse.ui.workbench 3.105.0' but it could not be found

Is there something I'm missing?

EDIT: forgot to mention "in eclipse" somewhere in the post.

It seems it's missing "bundle org.eclipse.core.runtime 3.9.0". Any idea on what do I have to change where to get this installed?

EDIT: Noticed this on the documentation:

The oldest Eclipse supported by the plug-ins is Eclipse 4.3 Kepler (CDT 8.3), and the recommended version is 4.4 SR2. Do not try to install them on Juno, Indigo, or older versions, since the install will fail.

I've added "C:\TD\TD_RF_Module_SDK-v4.0.0\gnu\bin" to the PATH environment variable, but I'm still getting some errors compiling the samples. Does this make sense?

if there is a mistake with your PATH, check your path doesn't include before older path with a "wrong" compiler.
On cygwin, you can check that :
$ which arm-none-eabi-gcc
returns:
/cygdrive/c/TD/TD_RF_Module_SDK-v4.0.0/gnu/bin/arm-none-eabi-gcc