Install/Upgrade Software on RD Session Host

We have a single RDS Server which has all relevant RD roles (licensing, session host etc.) and am wondering about installing new software or upgrading existing software when it comes to when this can occur. I know the change user command for install vs execute, but do all users need to be logged off before any software can be installed or upgraded?
For Example, Adobe Reader XI is installed (11.0.1) but some websites complain that it is not the absolute latest version (11.0.5) so will not let a User open a file. I am ok with installing 11.0.5 but do we need to boot all users off or do later that night?
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FlippAsked:
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Cliff GaliherCommented:
Really the rules for upgrading software on an RDSH are the same as upgrading on a workstation. If you've tried to upgrade adobe reader when you had a PDF open, it fails.

Can you get away with upgrading software while users are logged in? Yes, as long as the software is not in use. Is there a risk of failure? Certainly. So it all depends on your environment and your users' usage patterns. It is always safest to have everyone off the system.
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FlippAuthor Commented:
Cheers cgaliher - I suspected as much but was hoping there was a way we could deploy updates while Users were still logged in etc. :)
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