I've just found a bug concerning the 'Update Now' function in ePO 4.5 patch1 with agent 4.5.
When individually selecting to update Host Intrusion Prevention patches the following error occurs:
Tuesday, March 02, 2010 9:05:58 AM Info Updater These updates will be applied if they are in the repository: HOSTIPS, 7000.
Tuesday, March 02, 2010 9:05:58 AM Info Updater The following packages were not in the repository: HOSTIPS, 7000.
It appears there is a typo and the name is mistyped when it should be HOSTIPS_7000. A full update will work but this does not allow you to limit what is being updated.
I've reported this to McAfee so we'll see what comes of that.
McAfee is to include this fix in the next epo patch which I'm guessing will be patch 4 now after patch 2 was renamed patch 3...