Cached client will automatically update itself. However, there are some instances when it may be preferable to remove cached client (such as its removal as part of a troubleshooting endeavor).
When used with Netscape, cached client will automatically remove any previous versions of itself from memory, including ResQNet V.3 cached client. When used with Internet Explorer, the new cached client is unable to remove cached client versions prior to 4.1. Older version of cached client must be removed from IE manually. However, leaving them will not conflict with your current cached client.
Manually Removing Cached Client from Netscape
Manually Removing Cached Client from Internet Explorer