In the 10 years+ that I've been using Sound Forge Pro, I can't recall ever seeing native Sound Forge FX on sale or available separately. An alternative would be seek out a 3rd party VST plugin that is similar to Graphic Dynamics.
If you have Sound Forge, the Graphic Dynamic plug-in should be available in Vegas. It is a Direct X plug-in, Otherwise, Melda Productions plug-ins has compressors with a graphical UI. MCompressor and MDynamics, I have not used them though.
I necessarily need "Graphic Dynamics" module of SoundForge to install it individually, and then open and run it on my DAW. How can I do that?
Sound Forge must be installed to access the Direct X Graphic Dynamics plug-in with Vegas. I just confirmed and it s available in the Vegas' FX chainer. I checked this on both Sony and Magix versions.
I know that we get attached to a plugin that is familiar, and does what we want; however, I adopted Toneboosters plugins a long time ago and haven't looked back. You can run it in demo mode.