Is available a new product/version for LiveCycle Designer or it was discontinued?
You can contact Adobe sales, Adobe Experience Cloud | Sales Inquiries
I don't think the LiveCycle Designer bit has changed much, if you have a license number for ES4 you can use the same number and download AEM Forms here, https://thelivecycle.blogspot.com/2016/05/aem-forms-designer-trial.html
It is now called AEM Forms Designer,
Scroll down to "Use Forms Designer" in the left menu
So If I understood now I need to upgrade to AEM Forms with "Forms Add-on packages".
Where can I get more informations about how upgrade (with prices) and migrate to Adobe Experience Manager Forms from LiveCycle Designer ES4?
AEM seems to me a cloud platform and not more a downloadable and installable software on your computer, is it correct?