want to add SSD in my Optiplex 3010 tower.

Hi. I recently bought dell optiplex 3010 at the refurbished deal.

and I changed Power supply, Graphics card and trying to add SSD as prior drive.

currently my computer has been operated windows 7, and trying to get an upgrade to windows 10.

but the thing is, if I would upgrade to windows 10, when I re-install to SSD which image should I use to do, also is my windows 7 serial would be available with that?

I found this link from dell (https://www.dell.com/support/home/ca/en/cadhs1/Drivers/OSISO) but it says to me as;

Recovery image currently unavailable.

The recovery image download could not be generated due to missing information. Please contact technical support for assistance.

so I don't know what to do to reinstall windows to SSD.

please let me enjoy my desktop with ssd...

and also, I found this article; https://answers.microsoft.com/en-us/windows/forum/windows_10/reinstalling-windows-10-after-upgrade/578d0b7f-57e4-4893-b9d1-6cfac0d6290a?auth=1

it says, 

Q: What happens if I change the hardware configuration of my Windows 10 device?

A: If the hardware configuration of your Windows 10 device changes significantly (e.g. motherboard change) Windows may require re-activation on the device. This is the same experience as prior versions of Windows (e.g. Windows 7 and Windows 8.1).   The free upgrade offer will not apply to activation of Windows 10 in such scenarios where hardware changes reset Activation.

is this mean because I upgraded hardware(graphics, ssd) If I try to reinstall, it'll not be activated?

Thank you.