I believe you need special software to legally load non-certified software, for testing purposes, onto an iPad. Overhaul/Beamdog I think uses TestFlight. I've also read that they handle some of the testing and QA with help of a software QA firm.
Trent did tweet, a couple weeks ago, that they can't load the test version onto an iPad Mini.
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Trent did tweet, a couple weeks ago, that they can't load the test version onto an iPad Mini.