Installation status stuck at "waiting" for long time

Sometimes Adobe’s systems experience temporary outages. You can check the System Status report below in real time.

https://status.adobe.com/

Also, turn off non-essential apps, antivirus scans, and any other background processes that could be interfering with updates.  The less work your computer has to do, the better.

first try, resetting the cc app: To reset the Creative Cloud desktop app, make sure it's in the foreground, then press: Win: Ctrl + Alt + R Mac: Cmd + Opt + R

if that fails, do a clean cc install:

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

then uninstall the cc desktop app, https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html

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

restart your computer (don't skip this)

download the cc desktop app by using the links at the both of this page, https://helpx.adobe.com/download-install/apps/download-install-apps/creative-cloud-apps/download-creative-cloud-desktop-app-from-web.html

install the cc desktop app using an administrator account (solution 4 here, https://helpx.adobe.com/creative-cloud/kb/creative-cloud-missing-damaged.html)

use the desktop app to install your cc programs/trials