Can I deactivate cs4 after I installed cs5?

I installed and activated cs5 and already had cs4 running on pc. I want to transfer cs4 to colleague so I need to deactivate cs4 and uninstall. Can I do deactivate and uninstall cs4 safely after I have installed and used cs5? Thanks for any advice
>>> Actually, I just read on another discussion re cs3 and cs5 - it is recommended that you deactivate and uninstall the earlier version before installing the newer version and to just use the old serial number when prompted by the new cs5 install. So i think the best solution is to un-install cs5, then deactivate and un-install cs4 and then re-install cs5.

If you don't want to keep the older version:
uninstall the older version first, BEFORE installing the new version.
The Adobe Uninstallers have a nasty habit of messing with essential support files of the new version because they mistake them for the older versions. When that happens, you have to jump through hoops just to uninstall the damaged version, as not even the Uninstaller will work on it. (You would need something called the CS3Clean Script, CS4Clean Script aor CS5Clean. Avoid having to go there. Honest.)
All Adobe upgrades are FULL INSTALLERS. The Upgrade installer will simply ask you for the old serial numbers when it doesn't find an older qualifying version installed.
Once more:
Do NOT uninstall an older version after upgrading to a new one; do it BEFORE.
Foretold is forewarned.
Wo Tai Lao Le
我太老了

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