Just to let you know that we've made available a new version of our Unity integration for mobile development that works with Unity Free!
You can find the updated Unity plugin along with details on how to unzip the files at the following link.
Without some of the optimizations that Unity Pro provides, such as batching, it may be challenging, with Unity Free on mobile, to achieve the kind of framerate that good VR requires but this very much depends on your use case.
Hoping you get the time over the holidays to build something great!
All the best from the Oculus team.
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