Hello everybody, with (too) many years of MSWindows behind me, I'm still puzzled by the simplicity of the installation and removal of applications in OSX. But, recently I had a (free) app that refused to upgrade to a new release on one machine (option greyed out), while it did the upgrade on another machine. I was too lazy to download the latest version, so I just removed the old app and copied the upgraded app from the other machine. Works great. Now I wonder: can I do that with any app? Just copy it to my laptop instead of downloading and installing it in Finder? Are there limitations? Thanks for answering. ;JOOP!