You can’t. T-Splines for Rhino doesn’t exist anymore (hasn’t for years) and the last version only worked in V5. With your V6 license key, you can download the Rhino V7 WIP and start testing its new Sub-D tools (under development).
A post was split to a new topic: Kangaroo package restore
Before going for V7.0 They need to make Move better! Version 6 but there is no proper function! During the move on shade view it is blocking the target view and it is placing on wrong place!
Other thing is Move Vertical function! absolutely undeveloped forgotten function! instead, it should be vector or line direction selection!
I think SubD modelling needs serious reconsideration. TSplines rightfully, just as Modeler in LW, or Modo, has shortcuts for selecting points, edges and polygons by using shortcut keys. This is a must. In addition, to extending edges and making poly’s (points to poly’s)these are also required for efficient modelling. Bridge command is useful but selecting ring or loop (edges, polygons) also need to be assigned to handy shortcuts.
If I can add, not only are the keys needed (shortcuts), but also icons that allow you to select points, edges or faces, as happens in TSplines and in many other similar software.
Currently to select these entities you need the mouse + the keyboard.
If the keyboard gets dead or breaks, what appens? 
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