Thanks scook, that put me on the right track. A little research brought me to an article re: enabling javascript in Internet Explorer. I found that it was already enabled. However, I reset my internet security zone setting to default. I was then able to complete the download and it installed with no trouble. The colors are great, and it's so nice to see the note values in staff view again!
Can't say for sure that resetting the internet security zone setting to default did the trick, but it may be worth keeping in mind.