Its 4.0.20505.0
and all my Nuget stuff shows 20710.0.
I have read I can generate a .PDB file only from source. So I loaded the source Mvc project and built it with .pdb`s only.
I took the the .pdb file and copied it to the directory you have seen in the dialog (my screenshot). Then I followed your steps again to Load Symbols From -> Symbol Path.
The dialog opens again and I choose my generated .PDB file and get this message box:
"A matching symbol file was not found in this folder"
uh... what now?