The "upgrade" was a version of the Quest install which didn't include the VB5 runtimes. Now, Windows 98 and later include the VB runtimes anyway, so what I've done is to add the VB5 runtimes to the "Windows 95 fix" download, and take them out of the main install.
So there's no "upgrade" download this time, and the main install is 2.7mb which is actually smaller than the main install for Quest 3.12, because I've taken the runtimes out. It's a time-saver for me at least as I don't have to test two installers - and very few people downloaded the upgrade anyway.
According to my calculator it'll only take you about 12 minutes to download even with your connection, so hopefully it's not too much of a problem