If he accepted the plea bargain of six months, then the case wouldn't have gone to trial, avoiding the excessive legal fees. I don't understand the timeline, but had he accepted the plea bargain, is it not possible that he would have already served his sentence by now?
Maybe. The point is that you shouldn't submit to 6 months of federal prison without trial or appeal, all the money loss for the two years in the case and your life ruined by the felony counts records for using a script to download files you already have legal access to.
At worst all there is to this is trespassing, on an open campus on an open network etc etc.
The american system is one of the worst in western society, granted, but the British one is not that much better at all.
Some claim is worst. I never had the misfortune of having to try that on my skin but heard from friends and family.