Kiwi Syslog Server v9.6.0/9.6.1 need ".NET Framework 4.0" ?

I tried to install v9.6.1 on Windows Server 2008 R2.

I had already installed ".NET Framework 3.5 SP1" on this system.

When I executed v9.6.1 installer, I got the following message.

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Kiwi Syslog Server 9.6.1 Installer

Microsoft .Net Framework 4.0 is not installed on this system

[OK]

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I can not install v9.6.1.

I got the same message, when I tried to install v9.6.0.

SolarWinds discribed the System Requirements as below:

NET Framework: .NET Framework 3.5 SP1

http://www.kiwisyslog.com/kiwi-syslog-server

https://support.solarwinds.com/Success_Center/Kiwi_Syslog_Server/Kiwi_Syslog_Server_Installation_Guide/020_System_requirements_for_Kiwi_Syslog_Server

http://www.solarwinds.com/ja/kiwi-syslog-server#requirements

Question:

Do Kiwi Syslog Server v9.6.0/9.6.1 need  ".NET Framework 4.0" or Higher?

Best Regards,