Can't speak to Fedora specifically, but most package managers let you configure the number of concurrent download threads it will use. Most are 3-4 it seems. Finding yours and setting it to 1 will probably do exactly what you're asking.
Another option is to set it to only download the files, then install manually once they're local to you. The options for this differ (eg. when installation order matters), so an RTFM is worth the time spent.