This is a desktop product and not a cloud product
Please let us how you purchased the upgrade LR6 in detail, which product did you provide that you had earlier which enabled you to buy the upgrade serial number?
When ever you activate an upgrade serial number, it always asks for previous version of serial number. I do not see any such serial in the Adobe ID account of this forum.
I have another account with my previous purchases, when I purchased LR6 upgrade I just had moved from Oman back to Germany. I requested a move of
My existing account but was told that this is not possible and I would need to open a new account in Germany. Now I cannot remember my previous account
details but I have all my purchases via email too.