Endless validating license loop during start-up of CC app

If you haven't tried below steps , try once:

Open Applications>Utiliites.

Locate Adobe Creative Cloud and Adobe Application Manager folder under Utilities window and trash both folders.

Step 2)

Trash Adobe Creative Cloud folder from Applications as well.

Step 3)

1) Right click on Finder icon and  select "Go-ToFolder " option.

2) You will get a text box, type-in below command and then hit 'Return' key.( Do not miss ~ symbol)

~/library

3)Then navigate to Application Support>Adobe.

Open Adobe folder and trash folders named AAMUpdater and OOBE.

Step 4)

1) Right click on Finder icon and  select "Go-To" Folder option.

2) You will get a text box, type-in below command and then hit 'Return' key.

/library

3)Then navigate to Application Support>Adobe.

Open Adobe folder and trash folders named AAMUpdater ,Adobe Application Manager and OOBE.

Step 5)

Click on the below link and download & run Adobe Cleaner tool :

If present remove Creative Cloud app /Adobe Application Manager.

http://download.macromedia.com/SupportTools/Cleaner/mac/AdobeCreativeCloudCleanerTool.dmg

Step 6 )

Click on the below link and download Adobe Application Manager and install the same :

http://download.adobe.com/pub/adobe/creativesuite/cc/mac/ApplicationManager10.0_all.dmg

Once the installation process is completed, installation box will disappear, then open Application folder and locate Adobe Application manager launch icon , double click on it and update .

Once the update is completed. It shud launch Adobe Creative Cloud app.