Updating WSUS 10.1 to 10.2.1 it downloaded all patches again

Hi,
In Australia we have capped Bandwith plans and so have to be careful with what we download. Sucks I know.
Last night downloaded WSUS offline 10.2.1 to upadate my older version of 10.1.
I downloaded the zipped http://download.wsusoffline.net/wsusoffline1021.zip
As all the downloads are downloaded to the client folder I just copied the client folder and pasted it to the new 10.1 unzipped files.
I left it to run overnight to update and in the morning it downlaoded ALL THE OFFICE 2013 FILES AND WINDOWS 10 FILES AGAIN using a totoal of 5 gb of data.
What did I do wrong? How do I update to later versions without downloading ALL THE PATCHES AGAIN. I have googled for a solution but cannot find info on this.
Any info would be greatly valued.
Thanks Spottsy
In Australia we have capped Bandwith plans and so have to be careful with what we download. Sucks I know.
Last night downloaded WSUS offline 10.2.1 to upadate my older version of 10.1.
I downloaded the zipped http://download.wsusoffline.net/wsusoffline1021.zip
As all the downloads are downloaded to the client folder I just copied the client folder and pasted it to the new 10.1 unzipped files.
I left it to run overnight to update and in the morning it downlaoded ALL THE OFFICE 2013 FILES AND WINDOWS 10 FILES AGAIN using a totoal of 5 gb of data.
What did I do wrong? How do I update to later versions without downloading ALL THE PATCHES AGAIN. I have googled for a solution but cannot find info on this.
Any info would be greatly valued.
Thanks Spottsy