what can't you open it? updating isn't required for that.
for update errors,
first, sign out and then back in to your cc app and retry updating, http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
if that fails, close your cc app and then reopen and retry updating.
if that fails, restart your computer, sign out and then back in and update.
if that fails,
Remove the OPM.db file and relogin into the Creative Cloud desktop application using the Adobe ID tied to your subscription.
Mac OS: You can locate the OPM.db file in the \User\<user name>\Library\Application Support\Adobe\OOBE folder. To access the hidden user Library folder, see Access hidden user library files | Mac OS 10.7 Lion.
Windows: You can locate the OPM.db file in the \Users\<user name>\AppData\Local\Adobe\OOBE folder. To view the hidden AppData folder, see Show hidden files, folders, filename extensions | Windows XP, Vista, Windows 7.
and you can always update by downloading the files directly and then applying them:
pre cc updates: http://www.adobe.com/downloads/updates/
cc 2104 updates: http://prodesigntools.com/adobe-cc-2014-updates-links-windows.html
I signed out and then back in which allowed me to update but now all my apps are saying "start trial" even though my account is subscribed?