Hmm, I suppose I could write a quick C++ program to generate a 2 GB file full of garbage that you could run on your PC. Would save you a massive download.
Edit: I tested the code I wrote, and it generates EXACTLY a 2.00 GB file. You should be able to use it twice to get 2x2 GB
All it is a simple console app. On my machine, it wrote the file in less than a minute. Thus it should be a ton faster than downloading a file of that size. Beware: It might put a good load on your CPU and HDD.