Fall Creator's Update refuses to install

That all looks fine.. I was just curious 'cos of the different names and sizes. Ok, so you have the CU, latest build, so Windows update has been running ok- that's good too.

I can only guess the HDDR partition is your manufacturer's recovery partition - to restore your PC to as it was when bought. You're not short of space, so can just be left as is.

Just to check the Recovery partition is correctly associated- boot to Safe Mode as I said.

Then please create your first disk image of what you have now to an external disk (which needs to be at least more than half the used space on your disk) using e.g. Macrium Reflect (free). That's just being cautious.

Then shrink C: by 2Gb using Minitool Partition Wizard.

Then download and run Hard Disk Sentinel (trial) to check your disk.

If ok, then you can either download the iso manually, and try the upgrade again, or try via Windows update- I'd recommend the former as it may take more than one attempt.

This time, disable your AV, do a clean boot and disconnect any peripherals you don't need- try not to use a wireless mouse.

You have Windows Home. Your only option would be to disable Windows updates.

dalchina said:

I can only guess the HDDR partition is your manufacturer's recovery partition - to restore your PC to as it was when bought. You're not short of space, so can just be left as is.

That machine didn't come with Windows 10, according to Toshiba's specs it came with Windows 8.1. It looks the right size to be an recovery image of the OEM Windows. The name sounds right too, my (older, Win7) Toshiba (system one below) had an 'HDDRecovery' folder on the D: Data drive for the same purpose. Note that it's Fat32, that would be required if it was meant to be loaded by the BIOS (commonly a Function key is available at boot to do a factory reset).

Casey said:

...having looked at the Toshiba website, it doesn't seem that my particular model is supported for the Fall Creator's Update. Odd.

You're lucky, mine isn't supported for any version of 10....

dalchina said:

Good to check that; many PCs are upgraded beyond the OS officially supported by their manufacturer...

...but I'm running Fall Creators Update on it.

NavyLCDR said:

I would just download the ISO file using the Media Creation Tool. Mount the ISO file, run setup.exe to upgrade. That has proven to be much more reliable in the past that using the upgrade tool or waiting for Windows update...

That's how I've always upgraded mine (well, I make the USB, but you use it the same way as an ISO).

The big advantage of using the ISO/USB to do the upgrade is that if it fails you get a full error code to aid diagnosis.

Casey said:

And then I'd miss out on security updates and such. Great! Thanks, Microsoft...

Hide or Show Windows Updates in Windows 10 Windows Update Activation Tutorials
You can also try that- and just hide the upgrade.

The difficulty with that is that you need to have it in the list before you can hide it, but when it fails it rolls back, removing the reference. I think this has been achieved before, but I don't know how.

If might be possible, for example, if you had updates set to notify, and you hid the update when you got the notification... that's a guess. Or you could try a manual check for updates, and if 1709's listed, then try hiding it.

It would be useful to find any reference to someone who's done that.