Not as common as it seems, more often necessary to downgrade your domain or forest, either because they are configured only for a very recent version of the Windows Server family, as shown in the example below (Windows Server 2012) and I need to perform demotion to Windows 2008 R2, in order to study.
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How to Upgrade Windows Server 2012 R2 Standard to Windows Server 2016 Datacenter
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Storing SSH keys in Active Directory for easy deployment
Migrating / Importing DHCP from Windows Server 2008 to 2012/2016/2019
Enabling RDP in Windows Server 2016
Remembering that it is not recommended to have Windows 2008 in your environment due to its end of support on January 14, 2020.
In this step, the domain level will be lowered to Windows Server 2008 R2, as shown in the figure below:
Set-ADDomainMode -Identity "yourdomain" -DomainMode "version you want"
In this other step, the forest level will be lowered to Windows Server 2008 R2, shown in the figure below:
Set-ADForestMode -Identity "yourdomain" -ForestMode "backwant"
After performing both domain and forest downgrades, new settings can be checked with the command Get-ADDomain and ForestMode, or through one's own Active Directory as shown below:
As a result it was possible to insert a domain controller with the version of Windows Server 2008 R2, this due to the lowering of the forest and domain level, observing the figure below:
reference: Mateus Henrique Tremonte Coimbra
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