...some (valid) product keys aren't recognised by Microsoft for the download site I referenced. It's been a work in progress for some years, but it appears they haven't yet "caught up".
If you can't get an OS image that way, then it's a fall back to cloning.
I think you envisaged a 2-stage process in your original post, but that is not the best way (and, depending on configuration, BIOs, etc. you may get a few issues.)
By far the easiest way of cloning is to attach the new drive (temporarily if necessary) to your m/c, and clone directly in one step.
You've said that you haven't got space to mount a second drive, but, if you have a spare header and power connection on the motherboard/power supply, it is quite easy (working carefully) to temporarily attach the new drive with the case open, using an extra power and data cable, for the purposes of cloning.
If you haven't got the spare connections, then a USB (worth paying the little extra for USB3) 3.5" disk caddy is probably the best idea (c£17 from eBay). Once the cloning is complete, you can switch disks and you have a decent, usable external disk.
As already mentioned, if one of the discs is WD or Seagate, then you can download tools from their support site (Acronis True Image and Seagate Discwizard respectively) to carry out the cloning under Windows. They are "tied" versions, and will only work if one of the respective manufacturer's drives is in the m/c.
Aoemei Backupper Standard will clone disks regardless of manufacturer, and is free for download and use from:
www.aomeitech.com/
(Though I've not cloned with this, I use it daily for full and incremental backups, and I've used Aoemei Partition Assistant to resize partitions - the software is simple and user-friendly to use).
Whatever software, you will have to nominate the source and destination disk, AND, I suspect you will have to select (or check that it is the default) an option to extend a partition to the new disk size limit (otherwise, you will end up with a logical disk the same size as your current one).
Once cloned, it is simply a matter of putting the cloned disk permanently into your m/c, and it should boot without issue.
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