You can download Free Editions which can be activated to with a product key to enable PRO Features.
Current versions:
tangible T4 Editor 2.0 plus modeling tools for Visual Studio 2010
Download from Visual Studio Gallery
tangible T4 Editor 2.0 plus modeling tools for Visual Studio 11 (Beta with April Updates)
Download from Visual Studio Gallery - Requires VS11 Beta 11.0.50323.1 QRELB or better
