Can I safely uninstall previous versions? Move licence to new PC?

I have PS going back to PS5 and all subsequent upgrade versions to CS5. Can I uninstall old versions through add and remove?
Also what is the procedure for moving to a new PC - regarding licencing? Do I have to load every version on the new PC till I get to CS5?
Thanks
John

Some people have had problems uninstalling old versions. They tend to take file associations with them, leaving "stuck" registry keys, so that you can no longer associate file types to open in Photoshop.
The way to avoid that is to uninstall everything in inverse version order, then reinstall the latest. Yes, it's a pain.
If you don't plan to use it on the old machine anymore, remember to deactivate. You're allowed two activated installations at the same time, provided you're the only user, but you may need the second activation later.
When you install an upgrade the installer will ask for the serial number of a qualifying version, if it doesn' find one on your HD. Put in the serial for the previous upgrade and go. You don't need them all, the installer is perfectly happy with the last one, even if that is in itself an upgrade.

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