Here's a crazy idea. Let me know if it wouldn't work:
Clone the hard drive on your work PC onto a second hard drive or SSD.
Put the second hard drive or SSD it. Upgrade it to Windows 10 to claim your "free" upgrade.
Put the old hard drive in it, and enjoy Windows 7 for a few more weeks.
When they give you the old PC to take home, put your new hard drive in it and enjoy Windows 10. Then reformat the old drive and use it for additional storage.
Here's a crazy idea. Let me know if it wouldn't work:
Clone the hard drive on your work PC onto a second hard drive or SSD.
Put the second hard drive or SSD it. Upgrade it to Windows 10 to claim your "free" upgrade.
Put the old hard drive in it, and enjoy Windows 7 for a few more weeks.
When they give you the old PC to take home, put your new hard drive in it and enjoy Windows 10. Then reformat the old drive and use it for additional storage.
That should work, while simultaneously breaching nearly every clause in any standard Acceptable Use Policy, as well as who knows how many other data protection clauses in his employment contract.
OP needs to remember that this is a company owned PC and more than likely isn't his to dink around with to this extent. IMO a $100 operating system upgrade is not worth risking employment.