I just bought an upgrade for lightroom 6, i downloaded it and now it says my previous lightroom 4 version serial number is not valid. This was a Education Edition but i think i should just work? What do i do? I can buy the full program but then I have to pay the whole amount again even though I just paid 75 euro's for the upgrade. Thanks in advance for any help.
Please follow the steps given on the following link if you get the error message “This serial number is not valid for this product" after you enter the serial number for your product: