Canon 5DS is not in the supported list yet.
Adobe Lightroom supports tethered capturing only for the cameras listed in the following document:
When can we look forward to a fix to this? Canon EOS 5Ds R are a "studio camera" and i as most studio photographer use lightroom tethering...
No problem, i solved it by coping fron frameworks in Canon EOS utilitys and replaced it in the LR foldern and now it works
If any body else need to do this you can get the info at this adress: http://www.zachardycapture.com/2015/06/21/native-canon-5dsr-tethering-in-capture-one-8-3/
BUT you have to find the place i LR by your self.