I have a white Newton 5+ with some keys like Powerstroke, GT key. And I wonder whether to go for anewton 6. Not because of the rain, it does not hurt me, I never ride in rains (at least intentionally

When google’d I could see some page on the old website of Ibikesports with a reference to the upgrade, but on the new velocomp website the upgrade was not listed as a product.
Is it the correct infornation? No longer it is possible to upgrade sending back his Newton 5 and getting a Newton 6?
If it is not the case, because the option is still alive, how much is the charge for it?