I assume it works the same as in TS12:
There is no such thing as a multiplayer route. Sessions decide if something is or is not multiplayer. So search for multiplayer sessions and you will find the related routes.
I see you also have TS12, so forget about multiplayer in 2010.
A note regarding that beta patch - it can only be installed on TS2010 build 44088 (44088 > 46170 > 49938). Build 49933 does not have Multiplayer in any form.