repa6

Specifically....running cmd.exe as administrator

C:\Windows\system32\dism /online /enable-feature /featurename:SMB1Protocol-Server

Check that it is working by:

C:\Windows\system32\dism /online /get-features /format:table | find "SMB1"
SMB1Protocol                                | Enabled
SMB1Protocol-Client                         | Enabled
SMB1Protocol-Server                         | Enabled