Hi there,
You can get the History of updates from the below link
Windows Server 2012 update history
https://support.microsoft.com/en-us/topic/windows-server-2012-update-history-abfb9afd-2ebf-1c19-4224-ad86f8741edd
Windows Server 2012 R2 Update (KB2919355) , is a cumulative set of security updates, critical updates and updates.
You can get it from here https://www.microsoft.com/en-us/download/details.aspx?id=42334
Once it it is done you can install then with the various deployment methods to your PC
Configure a Disconnected Network to Receive Updates
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/dd939873(v=ws.10)?redirectedfrom=MSDN
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