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I've had this problem with other updates (not 14.0.4a.413 specifically) and what worked for me was moving the install files to the C: drive. For some reason it just wouldn't run while they were on E:\. Might also help to right-click on the setup.exe file an use "Run as administrator"
Thank you tcfitzgerald that sorted that out straight away.
I had tried to install it from the documents and download folders but didn't think to try from C:\