There is no bug in the executable causing this. It is strictly a localized issue.
It is corruption of the files causing these problems. We have no control over it. How many of you are trying to run the installer/patch from an SSD, or installing to an SSD?
By the way, disabling most anti-xxxx programs only disables the reporting of issues, it does not stop them from actually running. Kaspersky, AVG, Norton, McAfee are all known to interfere with the executables. The problem stems from all these anti-xxx programs assuming compressed data in an executable is a virus.
There is also an SSD firmware bug, which the patcher will hit, which can cause problems with the patch. We ran into this during Beta.
We may have to do what other game companies have been forced to do and that is to ship a small installer which will copy the files from our server (over the Internet) and install them one at a time. It might work around these issues.