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NETx Server products require the .NET Framework 3.5. The installation is typically done through an online installer during the setup process.

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Installation can be done using the Windows installation media (DVD or disk image) of your Windows version (810, 1011, Server 2012, or Server 2016).Server 2016 or Server 2019).

If you do not have an installation media ready, you freely download it from Microsoft:

• Windows Server 2016: it is sufficient to use the evaluation version provided here: https://software-download.microsoft.com/download/pr/Windows_Server_2016_Datacenter_EVAL_en-us_14393_refresh.ISO
• Windows Server 2019: it is sufficient to use the evaluation version provided here: https://www.microsoft.com/en-US/evalcenter/evaluate-windows-server-2019
• Windows Server 2022: it is sufficient to use the evaluation version provided here: https://www.microsoft.com/en-US/evalcenter/evaluate-windows-server-2022
• Windows 10: use the media creation tool: https://go.microsoft.com/fwlink/?LinkId=691209
• Windows 11: use the media creation tool: https://go.microsoft.com/fwlink/?linkid=2156295  

Afterwards, do the following steps for installing .NET 3.5:

1. Insert the Windows installation disk in your CD/DVD drive so that Windows can access its content or mount the ISO disk image as a drive.

   1. For mounting an ISO image, right-click the ISO file and select "mount"

2. Open command prompt with administrative privileges

3. Issue the following command
   
   

   Code Block
   Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\Sources\sxs /LimitAccess

   and replace the source location according to the path of your Windows DVD.
   
   Installation will take a few minutes and result in a message that the operation completed successfully.

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If these updates are installed first and then you try to install the framework, you will get the above mentioned errors. You will need to uninstall the above mentioned updates, install the .NET Framework 3.5 through one of the methods mentioned above and finally install the updates again.

Article applies to the following products:

• NETx BMS Platform
• NETx Multi Protocol Server
• NETx BMS Server 2.0