Hello and thank you for your answer..
But actually, it still doesn't work, every time I clic "upgrade", when I'm trying to buy it, it comes back to "full program".. I'm losing my nerves, it doens't make any sense if I can't juste have an upgrade, I bought the programm already when I got Lightroom 5. Any clue?
I can't reproduce this. When I click on Upgrade, I can then select the previous version of Lightroom I own, and click on Add to Cart, and it charges me the upgrade price, not the full price.
In other words, its working fine for me.
If it's not doing this for you, show us a sequence of screen captures.
One of the key steps is that you need to indicate what version you are upgrading from. It's not until you put in that information that the price will change.
Thank you for your help, it actually did work, I had kind of hallucination I guess, I didn't see that I had to put the version I already had.
Thank you again! :-)