Is there any way I can rollback to old Nuget Package Manager (the one which comes with VS2013) for VS 2015, Nuget Package Manager with VS2015 is slow and doesn't even support simple things like update all and if you look at the reviews provided it is just bad :(
I have tried to find the old version thru Tools -> Extensions and Update as shown in the below screen shot.
Just a side note, to update all the current packages that are in project you can go to Package Manager Console (Alt + T -> N > O) and type "Update-Package" and press enter. This will update all the existing package.