a brilliant Idea is the land recovery, were the ballute/balloon are used too keep ROOST in air like airship
ROOST makes no landing on ground but stop in air and floats, thank the helium and hydrogene in the ballute/balloon!
I've noticed NTRS goes goofy from time to time. Apparently NASA is constantly tinkering with their DNS somethign or others which occasionally cut off my access to their website. I'm sure it happens to others as well. Wait a day or three, try again.
Whenever my PDF downloads get stuck (which happens quite often these days, a problem with the more recent Adobe Acrobat, maybe?) I find that using the "Download file" instead of "Display file" option works most of the time. Afterwards I can always dump the file if I don't like it.