matchboxbananasynergy It wasn't really possible because that's a much more complex task to upgrade this machine with the way I have the drive partitioned. It is also a mid 2012 model, so the upgrade path certainly doesn't support the most recent software. I'm actually needing to move to linux probably on this laptop, but that's a whole different story.
I was able to use a different machine running Windows 10 though. The web install happily updated the boot loader, overwrote the factory Android image on both slots, undated the radio, and then crapped out because it couldn't access a directory that it had just unpacked. I was not very thrilled that my phone was left basically only able to get to the bootloader and no further. I tried 3 times and it failed at the same point each time with not a very good error message. This is precisely why I wanted the unix command line originally.
Before I started to scramble to figure out how to get my old Android reinstalled again, I decided to give the manual Windows installation a try. It worked flawlessly and I had GrapheneOS installed in maybe 5 minutes, so I was happy about that.