You can easily find your Thirdwall version from the Thirdwall Location screen and clicking the Question mark icon in the lower left-hand corner. This will display the Thirdwall "About" dialog.  In this example, the version is '2.2.1.9'

Method 2

Open the Automate Plugin Manager.  Find the Third Wall Server entry and check the posted version.  In this example, the running version is '2.5.2.8'