Die deutsche Fassung finden Sie hier.
Did you follow the Ultimate Extension Guide, that we linked to on the download page?
Did you follow the set-up instructions and save the config? What status was responded?
Are you getting 404 messages? Flush your Magento cache, log off from Magento Admin Panel, then log back in and save the cobby configuration again.
Other things to look out for:
Check that your server is not in maintenance-mode
Check that your license key is 33 characters long and has no leading or trailing spaces.