====== Installing Microsoft .NET Framework 4.0 Failed (-939523550)====== 
======(Rhino 5 for Windows) ======

> **Summary:** //How to fix Installing Microsoft .NET Framework 4.0 failed (-939523550)//
> **Related installation help:** //[[installproblems|Troubleshooting Rhino 5 Installation]]//

=====Problem=====
The log file shows "Installing Microsoft .NET Framework 4.0 failed (-939523550)"

=====Answer=====

Install .NET 4.0 framework separately.
  - Open **Windows Explorer** and browse to the Rhino Installer DVD.
  - Open the **Installers\Prerequisites** folder.
  - Run the [[http://www.microsoft.com/en-us/download/details.aspx?id=17718|dotNetFx40_Full_x86_x64.exe]].
  - If the Microsoft .NET installer shows an error: 
    - Write down the error. 
    - Proceed to Step 2.
  - 64-bit Windows XP only:
    - Download and install [[http://www.microsoft.com/en-us/download/details.aspx?id=8483|Windows Installer 4.5 Redistributable]].

After installing .NET 4.0, return to restart the Rhino installer.

{{tag>rhino5installationerror_en}}