need to Download Link for Sophos Enterprise Console 5.3.1

Hi, 

i need a setup for Sophos Enterprise Console 5.3.1.

I need to update the old console (5.3.1 to 5.5.2)  but I need a old setup to remove the encrypted software. (Encryption is installed. Please migrate any computers and uninstall it before continuing.)

Where can I download it?

Thanks for your help.

Mehdi