Click on the "Products" link at the very bottom of the adobe.com home page, you'll then see Lightroom on the list. Click on "Buy", then you have the option to buy a "Full" license, but if you're upgrading then click on the "Full" drop-down arrow and select "Upgrade".
ok, thank you i see.
well it's really hidden .
créative cloud il put in the front of the scene ...
thank you for your quick response.
Then after doing that, you need to follow these instructions to enter your serial number and convert from Lightroom CC to Lightroom 6: