If you desperately need VS 2012 support, for instance if you need to use a library that is super hard to compile for VS 2015 (like me!) then you can always develop against a previous point in the commit history.
I have a project going using something close to 0.9 in VS 2012 using this branch:
https://github.com/andreasmuller/openFrameworks/tree/dancers_project_vs2012
Obviously comes with it's own drawbacks, but can sort you out with a working VS2012 project file if needed.
Best,
Andreas