On 20/10/2013, at 2:09 PM, Stephen Chape <chap...@bigpond.com> wrote:

> Hi folks,
> 
> In the last 24 hours I have brought my daughter's iMac from Snow Leopard to 
> Mountain Lion.
> I was concerned about how to do this on her iMac at first because she has 
> never had an Apple ID.
> So first I set up an Apple ID for her.
> However when I started the update her iMac threw up my Apple ID so I 
> continued using that (just to make things easier).
> Obviously I have used mine on her iMac in the past.
> It is now all done.
> 

You've got a problem now. 

In the App Sore application, you can go Store > Sign in... before you purchase 
anything. This gives you the chance to change to your daughter's login. The 
confusion arises from the fact the the App Store remembers your previous login. 
Because you started the download without changing the login details, your 
daughter's copy of Mountain Lion is forever linked to your account. 
Fortunately, for future purchases, you still have the option of signing in with 
her account before buying anything more. This change will be remembered in 
future logins until it is changed again. Armed with this knowledge, you should 
have no trouble with downloading Mavericks for her when it is released (perhaps 
as as soon as Wednesday!)...

Peter Hinchliffe        Apwin Computer Services
FileMaker Pro Solutions Developer
Perth, Western Australia
Phone (618) 9332 6482    Mob 0403 046 948
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Mac because I prefer it -- Windows because I have to.

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