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This can happen if you are trying to update through iTunes.
Instead go directly to the download page and download the latest installer
When you are asked to Save or Run, choose Save.
Then once it is downloaded try running it, you shouldn't see that error again.
If you have any problem that way, try right clicking on the download and click Run as Administrator.
If you have any questions please let me know, many thanks in advance!
If I have resolved your issue please take a moment to click the star rating system to rate my answer.
If not please get back to me for more help.
How did that go, were you able to install the latest iTunes that way?
Thanks in advance.