What you need to do to deactivate Photoshop Elements?

you can have two comouters acitivatd at same time but at same time you xan use only one.

Hi,I have no idea how to do this. My serial number is valid for two computers, so I need to deactivate one of them before installing my disc on a new computer

By @Alex267069905i9v

You just need to enter the license code on each of the two computers to activate. You can have two computers activated at the same time, but only one used at the same time. If you want to have more computers with PSE installed, no problem, but you need to deactive one of the two activated computers to activate the new one. Menu Help > sign out or sign in.

Remember the license is personal.