When expanding this file "terrain-reg-02-north-america-2014-08-26.zip", after it hits about 41% complete, I start getting a whole bunch of file errors. I think it says something like 'error extracting file blah' and then says no details are available. You can retry (which will fail) or skip. I manually skipped about 25 of these and it was still only 42% of the way there, so I said skip all. But this means I have a whole bunch of files missing on my thumb drive. What's the solution to this problem?