@Matias Marchetti
Hi,
OEM Microsoft Windows Server licenses DO grant downgrade rights. OEM versions released with, or after Windows Server 2003 R2 allow the end user to downgrade to an earlier version. To downgrade the customer must supply media to the OEM System Builder. The media must come from a legally licensed version of that
product purchased via Microsoft retail, OEM/System Builder, or Volume License channels.
It is feasible in theory, but you'd better call to confirm whether it still provides.
https://www.microsoft.com/en-us/licensing/existing-customer/activation-centers
Hope above information can help you.
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