The store showed the Pro upgrade first as 'buy, costs XXX', but later it changed to 'begin installation', but it did not work. I spent some time in the support chat with MS guys, with no help from them, not even with my order id or invoice number (for the Win10 Pro upgrade). I installed Win7Pro and after that Win10Pro to a separate partition, both as UEFI. I changed my original 256GB SSD out and replaced it with a 512GB SSD (This might be the cause for auto-activation failing, some of the support pages of microsoft said something like 'if you do considerable hardware changes, like motherboard or hdd, you need to activate with Support'). I had some issues with the Win10 (probably because of the 8.1 -> 10 upgrade), and had a need for Win7, so I decided to do a clean install of Win7Pro/Win10Pro dual boot. Upgraded to Win10 soon and later to Win10Pro (through the store).

After you register on first start up any reinstalls on the same machine will automatically retrieve the MOBO info. Join Date Nov 2013 Reputation 144 Posts 3,854

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