Download Failing

I recently bought the Scarlett 2i2 studio bundle, and it came with the product key to my Cubase software. So i tried to download it (2.6 GB) and it finished. I got an error message that it was an invalid program and there were errors opening it etc… I looked and it said i had downloaded only 1.17 GB. So i tried to re-download two more times, but to no avail. I know it isn’t an internet problem because i had just downloaded a 3.1 GB (a Linux OS) program two days ago. It is getting really frustrating. Any tips?