Rhino6 PackageRestore not working - please help!

i just downloaded my trial version of Rhino6 for windows.
i am trying to open Grasshopper files which include for example Kangaroo 2.3.1, or Kangaroo 2.2.1, when i open the Grasshopper file and do a Package Restore for the missing Kangaroo versions it says “successfully installed, restart Rhino”, i do this but nothing changes, the same error keeps showing up as if nothing has been installed/ changed!
Question:
what to do? do i need to Download and Install these Kangaroo updates directly from Food4Rhino?
if so do i have to install these one at a time in the order of oldest update to newest update or does the newest update automatically include all previous updates?
does Package Restore generally work?