Possible false / positive with Photomatix Pro 4.2.1

Just tried to download new update of Photomatix Pro (from here: ht tp://hdrsoft.com/download/win.html) 32-bit version and the file gets deleted when it finishes downloading on Internet Explorer

 

Here are threat details:

 

 

Full Path: c:\users\wojtek\appdata\local\microsoft\windows\temporary internet files\content.ie5\1cmz35ww\photomatixpro421x32.exe
Threat: WS.Reputation.1
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On computers as of Not Available

Last used 2012-05-18 on 11:47:58
Startup Item No
Launched No
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Unknown
Number of users in the Norton Community that have used this file: Unknown
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Unknown
This file release is currently not known.
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Medium
This file risk is medium.
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Threat Detail
Threat type: Insight Network Threat. There are many indications that this file is untrustworthy and therefore not safe
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ht tp://s3.amazonaws.com/photomatix-en/PhotomatixPro421x32.exe Downoaded file photomatixpro421x32.exe
Threat name 
WS.Reputation.1 z
amazonaws.com
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File actions
File: c:\users\wojtek\appdata\local\microsoft\windows\temporary internet files\content.ie5\1cmz35ww\photomatixpro421x32.exe
Removed
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File Thumbprint - SHA:
27f270ae6a57c0c75a0665d8565438937ef46bd093aae2406a353bcdb6862682
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File Thumbprint - MD5:
d953daf6ae3f69403e5809a5d9a070cb
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[Edit: Removed the link to direct executable to conform with Participation Guidelines and Terms of Service ]