2018-06-17 17:09:45 UTC
This worked first time for me, one Win7 and three Win10s.
Do the following for each computer.
1. Network & Sharing Centre > Change Advanced Sharing settings.
Turn on Network Discovery, file and printer sharing, sharing so anyone
with network access can read and write files in the public folders.
Turn off password protected sharing.
2. Computer (This PC), Map network drive. Set drive letter (Z default).
Folder set by browse (I chose User/Public).
And that's it.