Downgrade from windows server 2019 to 2012

Hi,

I installed windows server 2019 rok on power edge t140, in order to run Tren Micro application. At installation of Trend Micro, at the moment, I have a request for upgrade windows server 2019 with the package KB29129442 and KB2919355. These package are supported for Windows server 2012. Therefore I would like to proceed to a downgrade from Win Server 2019 rok to Win server 2012. Can tell me someone how to need to proceed for this downgrade? There is any procedure?

Thank you

Eugen