If you have a Thea For Sketchup 2.0 node-locked licensing (*.dat license file), you can activate it from within Skecthup.

Go to Extensions > Thea Render > License Setup

In the License Setup window, switch to the Node-Locked / Educational tab.

Check the License File (.dat) box and then click Browse

Navigate to your license (*.dat) file in the File Explorer.

Finally click on Activate.

You get confirmation that the license has been activated:

 Click OK. Note that the License Setup is now displaying that your license is activated (Status: Activated (Node)).