Windows 10: Win 10 Activation. Must reinstall?

I have installed Win 10 via Boot Camp on an apple MBP using an iso from microsoft. I was a fight, and I don't want to reinstall windows. If I buy an activation code must I enter it durring the installan prosses, None of the instructions on line mention adding the code to an existing installation.Thank you for listening to a super basic question !!!Best!=m=

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active a win 10 reinstall

I got win 8 geniuene, then upgrade to win 10 for free. But now I must replace my HDD and reinstall win 10. How can I active it?

 

How to reinstall Windows 10 if my computers used the free upgrade from 7 and 8?

1 of my laptop has win 7, but not ufei so the key is not in the bios, but I did use the internet after I upgraded to win 10, so it's safe for me to just wipe and reinstall win 10 with win 7 key?

seems like my win 8 machine will be fine with the ufei thing.

 

Reinstalling win 10

Hi

I want to reinstall a laptop currently installed with Pro x32 version and I have few questions please.

1. Would the activation key still be valid if I will install the x64 version (Machine has a x64 CPU).
2. I am not sure whether the current installation is a "upgraded win 8 " , or is it a direct win 10 setup.
   With respect to the later activation, should I really care?

I far as i know, when upgrading from win 8 to 10 the activation key is no longer displayed in the system information. Instead all XXX-XXX-XXX-XXX is displayed.
But when checking another machine that I know for sure that has been upgraded from Win8, I see this 00330-80000-00000-AA695 product key, which looks with two many zeros.
The machine I want now to reinstall, has also this kind of many zeros product key, a bit different though.
Tx