Windows 10: iMac Bootcamp Product Key Problem

So I had an iMac that had Windows 10 downloaded via Bootcamp. I no longer use that iMac and instead, use a computer with inactivated Windows. The iMac Bootcamp had a product key I bought from a store and I want to remove it, but I lost the boot drive to get into Windows on the iMac. Could I just delete the Windows Bootcamp partition on the hard drive to remove the existing device that uses the product key?

:)

 

License Activation On Apple Hardware - REINSTALL, NO BOOTCAMP

BACKGROUND:

• Purchased Windows 10 Home at Best Buy on USB stick
• Purchase Included a Windows 10 Home Product Key
• Installed Windows on iMac using Apple's BootCamp utility
  
• Windows 10 installation resides on it's own partition
• Runs perfect

THE PLAN:

• Reformat iMac Hard Drive as NTFS
• Reinstall Windows 10 Home on full drive, eliminating Apple's OSX system
  
• Use the iMac as a Windows machine

QUESTION:

Will I encounter any License Activation Issues? If so how do I deal with it?

 

Windows 10 reinstall and Bootcamp on iMac

Sorry if this has been covered/answered previously, but I could not find anything covering this.

We have a training lab comprised of 30 iMacs that are bootcamped. They originally had Windows 7 installed on the BC partition, and then all had the free Windows 10 update upgrade installed. We currently have physical copies of Windows 7 install discs with
their original product/license keys. After our training classes, we would like to be able to just do fresh installs, so we don't have to manually remove all the stuff loaded onto the machine during the training class.

Is there a way to remove and reinstall Windows 10 on the bootcamp partition, using a Windows 10 ISO, and use the Windows 7 key we have from our original purchase, since the original free upgrade offer through update is no longer available?

 

Windows 10 upgrade on a 5K IMAC running windows 7 with Bootcamp

I have a new IMAC 5K running Windows 7 with Bootcamp. Will I be able to upgrade to Windows 10 or will I have to wait for new Bootcamp drivers from Apple at some point in the future?