Support for the A7R II was added to LR 6.1.1 & LR CC 2015.1.1 & the DNG Converter 9.1.1. LR 5.x and earlier will only be able to read DNGs you create from the Sony raw files using the DNGC 9.1.1:
I spoke to Adobe yesterday late afternoon. They told me the Sony A 7rii Raw files would not be accessible by PS or LR until the next update came out. I have LR and PS CC updated.
I both said and posted two Adobe website links that indicate support for the A7R II was added to LR 6.1.1, ACR 9.1.1 and the DNGC 9.1.1. If you want to wait another few months when the .2 releases are out, before testing this, ok, it's your camera, not mine.
LR 6.1.1 supports the camera, LR 5.anything will never support it so you either have to pay for a new LR version or use the Free DNG Converter 9.1.1 or newer to create DNGs that will then work in the older LR you have.