reset your preferences -
http://helpx.adobe.com/flash/kb/re-create-preferences-flash-professional.html
(or remove Win: C:\Users\<username>\AppData\Local\Adobe\Animate CC <version>\ and
C\Users\<username>\AppData\Roaming\Adobe\Animate\<version>\
Mac: /Users/<username>/Library/Application Support/Adobe/<Animate CC version>/ and
/Users/<username>/Library/Preferences/Adobe/Animate/<version>/)
if that fails:
uninstall everything cc 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)
reinstall the cc desktop app, https://creative.adobe.com/products/creative-cloud.
if you're unable to install the cc desktop app at this stage, use 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