Confused about XCode Installation/upgrading… .

Getting old is hell…

Anyway, I noticed that Xcode had been upgraded to 4.1.1. I have three macs and I have
Xcode 4.1 installed on all of the rascals.

I initially downloaded the Install Xcode App, copied it to my NAS and then on each
of the three machines I used a fresh copy of the Installer to install Xcode.

I think something got confused…

On the Mac App Store the Updates screen show no updates but under purchases ( on at least
two of the machines ) the 'Install' button appears to be highlighted i.e. it appears
that the MAS does not believe that Xcode is installed.

Clicking the Install button starts a very large 3+GB download. On the initial install
machine it took several tries before the install process completed. Xcode still shows
4.1 as the version number.

I have started the install process on the second machine ( it still has a couple
of hours to go..)

In addition the Install Xcode app stored on the NAS now shows as a damaged app ( so
I deleted the rascal).

So, what is the appropriate way to handle the Installation and Upgrading of Xcode in
a multi machine environment.

It seems more that rediculous to have to download 3+GB to each machine every time there
is an update…

Thanks

Jerry