It is impossible to download the software Acrobat pro dc because the issue "echec of the http request". What can I do ?

Download & Install instructions https://forums.adobe.com/thread/2003339 may help

-includes a link to go to a page to download Adobe programs if you don't have a disc or drive

-Cloud desktop http://helpx.adobe.com/creative-cloud/help/creative-cloud-desktop.html

-Cloud Getting Started https://helpx.adobe.com/creative-cloud.html

-you will need to enter your original serial number during install for non-Cloud programs

-or kglad links in reply #1 here https://forums.adobe.com/thread/2081216 may help

Also go to https://forums.adobe.com/community/creative_cloud/creative_cloud_faq