Hey Tsunamijhoe,
I’m planning on keeping these up indefinitely, so there’s no rush. In all honesty, I’m not sure if upgrading your accout would be enough to bypass the 5 gig limit, since all my stuff is posted for free.
It might be worth it to try. The plans start at only about $5 a month, and you don’t have to renew when your month is up.
Otherwise, download 10 files, wait 6-8 hours, download another 10, repeat until finished.