Hi Ahmed,
Sorry for the delay in response. Please see the latest Installation guide. Here is the relevant information:
The servers where Chat Portal or Integration Interfaces package is installed (for interfaces such as OII, DAI and so on).
a
ASP.NET must be enabled.
Microsoft Visual C++ Redistributable for Visual Studio 2012 Update 1, 32–bit version
Microsoft .NET Framework 4.0, full package
Additionally, the OII interface requires also Microsoft Visual C++ 2010 Redistributable Package, 32–bit version.
NOTE: The specified 32–bit editions must be used also on 64–bit servers.
You can verify if you have these installed via your Control Panel. I should look similar to this with (x86) at the end.
I hope this helps.
Thanks,
Marcus