Hi P. Phillips,
thanks, you have been really straightforward in your explanation.
I have always had the habit to download and save the OS and the applications run, since when I was using Windows.
And to be honest I did it with Apple too.
This was doable until I was using apps which were installed with a simple copying and pasting from the App Store to the Application folder; so the only thing to do was copying and pasting from the Application folder to somewhere else.
Things get more complicated when the installation requires a more complex procedure.
Now you are definitevely telling me that there is no practicable way in the Apple system, so I can stop looking for it in the web.
I am not happy about the answer, because I was pretty sure it was doable, but I need to accept it!
Thsnks a lot for your time