Our file uploader can only handle files up to 500 MB, but remotely-hosted files can be up to 2 GB in size. If your remote files are larger than that and need to be separated into smaller parts, you can create a separate product for each part, then create one more product to actually sell which would "bundle" the other products' files, as explained in Approach B on that help page you linked.
However, considering how long it would take to download files that large (e.g., a 2 GB file would take several hours to download over a 1.5Mbps residential broadband connection), you might consider using a disc-fulfillment service that can automatically burn and mail a physical CD/DVD to buyers on-demand whenever an order comes in:
http://www.e-junkie.com/ej/help.integration.htm#CD-DVD