Please provide download link Vlcould
You will only get the latest version for trial which can be found below.
Download VMware vCloud Director to Build Private Clouds
On the contrary if you own a license you can download the 5.1 version.
I second this.
You can only download the most current version of the Appliance when in a trial license situation. If you own a full purchased license, you can download anything which is still publicly available.
I need 5.1 evaluation version. Please let me know if you have third party link.
5.5 vcloud is not compatible with vcenter 5.0 version
I suggest you not to download the appliance from third party sites. And you will not find it too.
You can upgrade the vCenter and then download the 5.5 Appliance.