Installation de Creative Cloud qui ne veut pas se faire...

check @AxelMatt;s link.  if that fails, skip the other two recommendations and start here:

reset the cc desktop app: make sure it's in the foreground, then press:

Win: Ctrl + Alt + R
Mac: Cmd + Opt + R

if that fails, try to repair
https://helpx.adobe.com/download-install/kb/creative-cloud-install-stuck.html

if that fails go ahead and uninstall using the correct uninstaller from https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html#sa_src=web-messaging and then reinstall

if that fails, do a clean cc install following each applicable step:

uninstall every cc app including preferences, https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html

then uninstall the cc desktop app, again using the correct uninstaller, https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html#sa_src=web-messaging

clean your computer of cc files per http://www.adobe.com/support/contact/cscleanertool.html

check for, and if available, update your os

repair all ms visual c++ versions that can be repaired.

update your ms visual c++, if it can be updated

restart your computer (don't skip this)

reinstall the cc desktop app, https://creativecloud.adobe.com/apps/all/desktop?action=install&source=apps&productId=creative-cloud

if you're unable to download the cc desktop app at this stage, use the "alternative download links" at the bottom of the page at https://helpx.adobe.com/download-install/kb/creative-cloud-desktop-app-download.html

use the desktop app to install your cc programs/trials

Restart the system and try the installation again. The version of the Adobe Creative Cloud desktop app installed on your system is not compatible with the installer. Download the latest version of the Adobe Creative Cloud desktop app and try again

For install 

1. to the Creative Cloud website.
2. Click Download next to the Creative Cloud desktop app. Your app begins to download. ...
3. Double-click the downloaded file to launch the installer. ...
4. Once the installer window opens, sign in to your Adobe account.

Please take a look here: Adobe Creative Cloud, needed to resolve this problem, is missing or damaged