There are some issues here.
The OS on the Dell computer was tied to the Dell hardware. Moving it to another computer will likely mean that the OS is no longer legitmate.
While the OS may still work without problems, anything that you do that requires validation/activation may have problems (such as the W10 update).
As long as the OS on the laptop is legitmate, then there shouldn't be activation problems with W10.
But the condition, age, and use of the laptop will affect your ability to update to W10 - before getting to the activation portion.
Next, you have to finish activation before the offer expires - so you can't finish activation on the Dell in time. You might be able to finish activation of the HP laptop tho'.
There's no way to save the W10 on the Dell hard drive as you won't be able to activate it. There's no "download and save for later" option from Microsoft.
The first thing to do, if the update fails, is to open a case with Microsoft Support before the free offer expires.
This will establish that you were attempting to upgrade before the free offer expired.
And, they may be able to help you get the upgrade sorted out.
Here's the link for that: https://support.microsoft.com/en-us/contactus/
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