Driver download file only downloads a PDF, not the driver.

I guess my main point was misunderstood. The "how-to" video was a completely different link than the one to download the driver. So the video had no relevance to the actual problem. All I could download from the DropBox link was a PDF ,rar folder which would not open because of a "corrupt" error. I never had access to any files that might have been in the folder. This is not Drop Box's fault, since the driver link was downloaded to the site by an obviously shady vendor. What confused me was that you said you had no trouble opening the link and everything looked ok. I could see the other files and their misc extensions listed in the folder, but they were inaccessible. So I think we both saw the same thing, and that's what looked normal to you. It doesn't matter at this point because I bought another adapter that, so far, actually works! Does DropBox have any way to filter out vendors who use it as a download point instead of providing a vendor URL? This could have been a disaster if I had been able to download and open a folder labeled "corrupt". I think we can call this a "case closed"! Thanks again for your interest.
Also: is there a "how to" area on the site? I have an old version and want to update it.