QUOTE(aldo @ Apr 4 2005, 20:27)
What you want to do is open a 'finder' window on your applications folder.
Double click on the Macintosh HD folder on your desktop.
Click applications on the side.
Now, double click on the dmg file. The main application (in this case MSN messenger) needs to simply be dragged from the 'disk' to the applications folder. It'll copy it over.
Finally, eject and trash the disk image. Then launch messenger from your application folder, or the dock if you have it in there.
Hope this helps...
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Exactly.
> Open .dmg File. (Might open on it's own after download)
> Whatever Folder or "Virtual Disk" this opens, drag contents of folder to wherever you like (As in the Example, Messenger to Applications)
> Delete (and/or Eject) everything related to the .dmg file (including the .dmg file itself, unless you are like me and back up .dmg files for Apps I might want to install after a format)
> Launch said App or whatever it may be (in example Messenger) from where you dragged it over to.
Basically to sum up what aldo and myself are saying the easiest way I can...When you drag the file, application, whatever it may be, over to whatever folder on your hard drive you see fit, it is then independent of the .dmg file that mounted it. If you just launch an app (as an example) from the folder the .dmg mounted, it is looking for the .dmg file before it launches, and if it does not find it, it will not work. This still does not sound right to me honestly, I did not think this way the way it was, but I am a creature of habit and I always copy whatever the .dmg mounts, so maybe this is indeed how it does work.
BAsically, Anytime you open a .dmg file, you want to copy whatever it's contents are to wherever you want, to make life easy.
As aldo said, I hope this helps.