update windows 8 prof to 8.1

I have to update some DELL Optiplex 3010 PCs with a pre installed Windows 8 prof System
after completing the pre Installation where I only had to choose the language type, a PC Name and a user Name and Password, i invoked the store ICON comming up with a big window whre i can choose to update to Windows 8.1Pro
After a click on the button  Download I get the Messge
You Need Administrator rights for installing Windows 8.1 ( I get this message in german language, so the translation might be different)
the user Name I used is a member of the local Administrator Group
I also tried to activate the Administrator account Logging in as Administrator I get a message
like It is not allowed to use the Administrator account for the Update
Gismo3Asked:
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JohnBusiness Consultant (Owner)Commented:
You do not need to use the administrator id as it is disabled and should remain so. Recheck that your userid is a member of the administrators group and then make certain UAC (User Account Control) is NOT disabled. It needs to be enabled.

Otherwise it should work - I did just as you did. Turn the computer all the way off, restart and try again.

.... Thinkpads_User
Gismo3Author Commented:
under local user and groups i checked the user I created during system installation
I can see that the user is a menber of Administrators
if I invoke UAC I see for levels (default was the third level) I testet the highest level,
restarted the computer but got the same result
JohnBusiness Consultant (Owner)Commented:
Make sure you have a verified login to the Windows Store for the computer you are trying to upgrade. You need that as well.

... Thinkpads_User

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Gismo3Author Commented:
I am happy to get a solution even on Saturday
JohnBusiness Consultant (Owner)Commented:
@Gismo3 - Thank you and I was happy to help - even on a Saturday :)    Cheers.

... Thinkpads_User
McKnifeCommented:
Hmm... that did the trick? I did not have to have a verified login for the store to do it.
JohnBusiness Consultant (Owner)Commented:
I need to log into the Store or I cannot access / update anything.

... Thinkpads_User
McKnifeCommented:
I don't.
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Windows 8

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