Software support for ILLiad 9.1 ended on 1 September 2024. OCLC-hosted institutions still on version 9.1 should contact OCLC Support and request an upgrade. Self-hosted institutions can find ILLiad 9.2 on the Atlas Systems ILLiad Downloads page. For download credentials, contact OCLC Support.
Here is the Atlas Systems article on Updating ILLiad to Version 9.2 as well as the ILLiad Release Schedule. Lastly, here is the article "When is a new version available?"