Trying to open Creative Cloud App for the first time, but I keep getting download error 87 - in the Adobe Application manager screen.

Follow below steps :

Uninstall Adobe Creative Cloud .  [ Only if Installed or ignore this step ]

Creative Cloud Help | Uninstall the Creative Cloud desktop app

Open Task manager, click on Processes tab, click on Show processes from all users, click on description field to arrange all the Processes in Alphabetical order.
Close all the Adobe related and setup related processes like AAMupdater, AAMupdater notifier, Adobe Crash demon, AcroTray , Armsvc ...Windows Installer , Setup.exe ...........etc from Task manager.

Disable Firewall Temporarily.

Step 1 :

Open C:drive and navigate to C:\Program Files (x86)\ " Common Files" \Adobe.

Open Adobe folder and delete folders named Adobe Application Manager and OOBE.

Step 2:

Navigate to C:\Program Files (x86)\Adobe.

Open Adobe folder and if present delete Adobe Creative Cloud folder. [**important]

Unable to delete??? rename it to Adobe Creative Cloud-old.

Step 3 :

Press Windows button (located between Ctrl and Alt buttons) along with R button together at a time , you will get a run command window.

Type in below command and hit 'Enter' key.

appdata

Then navigate to Local>Adobe.

Open Adobe folder and delete folders named AAMUpdater and OOBE.

Step 4 :

Make sure Adobe Creative Cloud is not listed under Control Panel > Program and Features. list.

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

http://download.adobe.com/pub/adobe/creativesuite/cc/win/ApplicationManager9.0_all.exe

Once the installation process is completed, locate Adobe Application Manager launch icon on Desktop and double click on it .

It will start update process.

once it is completed,

it shud launch Adobe Creative Cloud app.

Please mention version of Windows .