Install Solarwinds Backup Manager with No Internet

I am in the process of evaluating different backup products for a collection of 60 virtual and physical servers.

I just tried installing this product on an isolated network (no internet connection at all). The first thing it attempts to do is connect to the Management service. Of course this fails. I then tried a command line install using the -use-proxy=0 switch. Same result.

Can this product be installed without internet access or have I completed my evaluation of this product?