Hmm... I've never had this problem before on any of the half-dozen or so systems that Solidworks is installed on, but for whatever reason, Solidworks refuses to download and install... even after doing manual downloads... it just says that files are missing (with a blank screen), or stops the downloading process partway through... where it stops seems to be entirely random. I've gone through every permutation possible, and none of them seem to make any difference. Except that now, after trying to piecemeal the upgrade by just installing one part, it says 305 MB need to be downloaded instead of 321. I'm entirely baffled as to why the software can't simply say what the problem is, what files are missing, etc.