Upgrade Installation server from 7.10 to 7.20 possible?

good morning,

in my company workstations the SAPGUI 7.10 for windows was installed from an installation server. I have now the

7.20 GUI CD and I wonder if I can create a new installation server in the some server/share and update the

workstations from this new 7.20 installation server.

Will the 7.20 installation program detect the upgrade, remove the 7.10 components properly and install the 7.20

new version in the client workstations?

Is this a good approach, or is better create a new Instalation server for the new version (7.20) and upgrade

the clients from here? This options seems more "clean", but needs more work.

Thank you by your opinions

Best regards