Receiving Error 301 on Mac CC

this was originally posted 2 years ago and several people are posting about a newer easier-to-apply solution from nmsoy (which i don't see in this thread).

anyway, here is an updated post for cc app problems.  the steps below the bold text was the answer 2 years ago that many are calling (appropriately) the nuclear option.  but there several less aggressive steps that can now be taken because adobe, in the past 2 years, has added the ability to reset the cc app preferences and to repair the cc app without requiring a reinstall.  these less aggressive steps are listed below:

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

if that fails go ahead and uninstall/reinstall per the above link

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, 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
check for, and if available, update your os
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