...I've got work to do!
UPDATE: Just on the off-hand chance that it might work, I brought my flash drive with me today just to see if I could download the photo editing program to it without being interrupted by our security software, and it appears that it has worked like a charm! (And only took five minutes rather than five hours.) I guess the trouble I've had in the past was only if I was trying to download to my machine, rather than to another drive. So, yippee and all!