You can do your drive upgrade either pre or post Windows 10 in-place upgrade.
Windows 10 license keys are tied directly to the motherboard in a system, and stored on Microsoft's servers, which is what allows you to reinstall Windows 10 on a system that had it at any point in time, even if you've, say, installed Linux on it for a while.
Personally, and it's just a preference, I'd do the Win10 upgrade first, then do the drive upgrade.
However, all of that is really dependent on your hardware meeting the minimum specs to handle Windows 10, and you've never mentioned the specifics. Posting a Speccy Snapshot would be helpful.
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Using Piriform’s Speccy to Collect Your Computer’s Hardware & Software Specifications
1. Go to the
Piriform Speccy Download Page and download the program.
2. Run the installer you’ve just downloaded.
a.
Note: The Speccy free installer may now come with Avast and the Google Chrome browser bundled with it (or something else, what’s bundled has changed over time). Make sure that you UNCHECK the options to install any bundled software when you see the checkboxes during the Speccy install sequence. When you reach the end, uncheck the
View Release Notes checkbox, then activate the
Run Speccy button.
You will then be presented the Speccy Main Window:
3. From the File Menu, activate the “Publish Snapshot” item [or press ALT+F,B]:
4. You will now be presented with the Publish Snapshot Dialog:
You will, of course, activate the
Yes button.
5. Finally, you will be presented with the Snapshot URL Dialog:
on which you will activate the
Copy to Clipboard button so that you will have the snapshot web address to paste into your message.
Note: If you want to save your system specs to a text file, at step 3 choose the Save as Text File option at step 3. This can be handy if you need to e-mail your specs.