We are moving our package management from manually updating files to NuGet. I am trying to install older versions of packages to match the one we already have in source cont
I had the same issue with the same message. But the reason of my problem was lost connection to TFS. My TFS server was hosted in other network and I used VPN for access to it. When I tried to install the package without established connection to TFS (VPN was turned off) I got the same problem.
Be aware of this TFS behavior.