Before updating, check server and workstation requirements for the new version by reviewing the ILLiad Release Notes and Hardware and Software Requirements for the version you are updating to.
Self-hosted sites should refer to the following articles for any update procedures unique to that update:
Scheduling an Update (Hosted Sites)
If you are hosted by Atlas Systems or OCLC, you need to schedule a server update before you can use the new ILLiad client. There may be a brief period of downtime while the server update runs. The downtime is usually brief enough that you do not need to communicate it to end users ahead of time.