Hi Richard!
We have some information in the release notes for GUIDE;
"If you are experiencing problems accessing network locations, then please refer to this website:
http://technet.microsoft.com/en-us/library/ee844140(WS.10).aspxPreferred workaround: If possible, keep your PLUS+1 related files in a source control system, and only check them out into folders that are physically located on your PC.
Alternative workaround: If your IT policies allow it, then modify the UAC setting to its minimum value."
Are you sure you have sufficient administrator access? This is a common issue when not having sufficient administrator access. I think the definition of admin access could have been changed a little bit in Windows 10. I've attached a document for you with some steps to see you have sufficient admin access.
Best regards
Nilla
PLUS+1 Helpdesk