Are we able to get the link for the download?
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Also, I saw a similar problem the other day, and thought I would mention:
It was an isolated problem with the actual file and KAV.
Download through Proxy with KAV, file downloaded ok, but is 1MB smaller than supposed size.
Download through Pure NAT with no KAV, file downloaded and could be installed.
When I was doing a manual scan on the file downloaded via Pure NAT, it was reported as a corrupted file. As a temporary fix, I set KAV to pass on corrupted files.