It seems you can't install the 1.1 beta if you don't have the original game installed. Here is a solution I found.
1. Go to the Impulse Settings and disable "show pre-release version". Restart Impulse.
2. Install Elemental (it's the old version). Switch "show pre-realase versions" on again. Restart Impulse.
3. Now you can install the (beta 1.1) patch
(sorry, was posted in the support section before)
Thanks Mechanoid !
Kind of makes sense to me after all it's a beta PATCH..... you can't normally install a patch without the software it patches already installed.
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