So.. You have a need for legacy ICA clients, do you? From time to time, I have various customers who require specific legacy versions of the client for one reason or another. Finding them on the Citrix downloads site has gotten progressively more and more difficult. Then, I discovered this site: http://www.xenappblog.com/downloads/?category=2
They have taken the time to collect and list download links for all the various versions from 6.3 forward. No excuse anymore!