the download speed is excactly the problem.
in the browser there is no limitation in speed (max. bandwith), whereas in ketarin is about 5kb/s.
i tried also faking user agents and analyzed responses with a traffic spy.
<?xml version='1.0' encoding='utf-8'?>
<Jobs>
<ApplicationJob xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Guid="48973901-967f-4a75-ab1c-64819d5071ad">
<WebsiteUrl />
<UserAgent />
<UserNotes />
<LastFileSize>0</LastFileSize>
<LastFileDate xsi:nil="true" />
<IgnoreFileInformation>false</IgnoreFileInformation>
<DownloadBeta>Default</DownloadBeta>
<DownloadDate xsi:nil="true" />
<CheckForUpdatesOnly>false</CheckForUpdatesOnly>
<VariableChangeIndicator />
<CanBeShared>true</CanBeShared>
<ShareApplication>false</ShareApplication>
<ExclusiveDownload>false</ExclusiveDownload>
<HttpReferer />
<SetupInstructions />
<Variables>
<item>
<key>
<string>linkt</string>
</key>
<value>
<UrlVariable>
<RegexRightToLeft>false</RegexRightToLeft>
<VariableType>StartEnd</VariableType>
<Regex />
<Url>http://www.truecrypt.org/downloads</Url>
<StartText>name="LinkT" value="</StartText>
<EndText>"</EndText>
<Name>linkt</Name>
</UrlVariable>
</value>
</item>
<item>
<key>
<string>version</string>
</key>
<value>
<UrlVariable>
<RegexRightToLeft>false</RegexRightToLeft>
<VariableType>StartEnd</VariableType>
<Regex />
<Url>http://www.truecrypt.org/downloads</Url>
<StartText>name="DownloadVersion" value="</StartText>
<EndText>"</EndText>
<Name>version</Name>
</UrlVariable>
</value>
</item>
</Variables>
<ExecuteCommand />
<ExecutePreCommand />
<ExecuteCommandType>Batch</ExecuteCommandType>
<ExecutePreCommandType>Batch</ExecutePreCommandType>
<Category />
<SourceType>FixedUrl</SourceType>
<PreviousLocation />
<DeletePreviousFile>true</DeletePreviousFile>
<Enabled>true</Enabled>
<FileHippoId />
<LastUpdated xsi:nil="true" />
<TargetPath>.\setup\TrueCrypt\</TargetPath>
<FixedDownloadUrl>http://www.truecrypt.org/download/transient/{linkt}/TrueCrypt%20Setup%20{version}.exe</FixedDownloadUrl>
<Name>Truecrypt</Name>
</ApplicationJob>
</Jobs>