Oh right, that ol' chestnut of Windows still clinging to drive letters.
Yeah, and it seemed to be a logical problem, made sense (now that the downloaded version was finally telling me
why it was failing).
Did you try the suggestion in the last paragraph and just copy the content of the installation medium to a local drive and install from there?
Yup, pulled the USB cable out of the printer, rebooted, PC still says that I have a printer but it's off-line. Same failure issue (because of the drive letter issue). Keep in mind that normally you'd be upgrading from the flash drive (which in this case was now drive E since the DVD drive is drive D) so the probability of mixing drive letters was pretty much nil, yet, it's still not proceeding.
Lastly, copied the contents of the flash drive to a directory on the HD, pulled the flash drive out (now showing two drives - C and D) and it STILL has an issue.
One thing I forgot to mention: The most FRUSTRATING part of this attempted upgrade was the fact that it had to "download upgrades" (taking up to 30-45 minutes) each time before it finally said "Can't do this, sorry." If it's going to have a problem with things being connected, etc, it would have been nice it if said that after "CHECKING YOUR PC" (before it goes for updates).
At that point, as a last-ditch effort to make this go through, I put the flash drive back in, restarted, got into the BIOS, selected the flash drive to boot from, and this time it booted successfully (unlike the store-bought drive just hanging at "loading files"). It still asked me if I wanted to wipe the drive and start fresh or if I wanted to keep programs and files and just upgrade the OS. I clicked on the option to just upgrade the OS - after a few seconds it comes back saying,
"Nope, sorry, not happening, not on this PC. You're going to simply have to wipe the PC and start fresh."
At that point, I decided to give up on the 'gentle' way of upgrading. I'm under the impression that it doesn't even want the DVD player in there (i.e., it wants the flash drive to be "D" and nothing else should be in there). Pulling the connector on the DVD drive was a bit much (it would mean pulling the computer out of it's spot, taking the side cover off, pulling the SATA cable, do the upgrade, reconnect the SATA cable. Still not sure if it would work or not but I'm not willing to go through that much excitement.
Use the media creation tool to make a new W10 image that you can burn to disc.
Yes run as admin if your not already
Actually, wanted to use the DVD drive in the first place. It says there's not enough room on the DVD drive to store all of the installation (I need "dual layer burning" as an option to do that and (1) I don't have that software and (2) I don't have a dual-layer DVD disk in my inventory. Really wanted to have this on DVD myself anyway as all programs I have here are on disk, nice and flat, store easily, labeled, etc. Now I have an OS on a flash drive which is too small to put a label on.
BTW, I did try it once as Admin, no effect, still fails with those same error messages.