If you just purchased the membership, please install the Adobe Creative Cloud Desktop from here:
Then, you can use the Creative Cloud Desktop App to install apps.
Once installed, you can access the Creative Cloud desktop app by clicking the Creative Cloud icon, located in the taskbar (Windows) or Apple menu bar (Mac OS).
If you already installed it, be sure to
If you purchased somewhere that gives you a redemption code, you can learn how to redeem your purchase, convert a redemption code to a serial number, use a redemption code to activate a Creative Cloud membership here: https://helpx.adobe.com/x-productkb/global/redemption-code-purchase-help.html
Now it says that i hae used the code already, so I can renew my memberschip... Can i do something about this?
It looks like the code has been redeemed with your (at)gmail(dot)com email address on 10th August 2015.
Please follow the steps here Sign in and sign out to activate Creative Cloud apps to convert all apps to full version using your (at)gmail(dot)com email address.