Not deploying Win10 here yet, but from what I've read you have to be using WSUS on Windows 2012R2 (W2K8R2 WSUS will not work) with the KB3095113 patch installed. And if your WSUS server has download issues with the Win10 patches you need to add a new MIME type to the IIS server.
Open your IIS MMC. Drill down into the website and select the Content folder. Over on the right hit the Mime Types icon. Add a new MIME Type. Bounce the server.
%systemroot%\system32\inetsrv\appcmd set config /section:staticContent /+"[fileExtension='.esd',mimeType='application/octet-stream']"