Issue:

When installing Update Rollup 2 for Microsoft Dynamics CRM 2013 on a Windows 2012 server using a custom number format in the Windows region settings the setup may fail with the following message:

"Failed to install required components: .NET 4.0 KB 2836939"

Cause:

The update installer may fail to evaluate the installed .Net version with certain number formats set in the region control panel.

This will result in an attempt to install KB2836939 which cannot be installed in Windows 2012.

Workaround:

Set  a standard number format in regional settings (e.g. decimal symbol = [comma], grouping symbol = [dot])

Add below registry keys (recommended approach)

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Extended\KB2836939v3

String "ThisVersionInstalled" = "Y"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2836939v3

String "ThisVersionInstalled" = "Y"

Status:

The issue has been reported to the product team.

Best Regards

Dynamics CRM Support Team