I upgrade the CRM v8 to the latest v8 version.

Servers were updated without problems, but the database is not updated.

I go to the Deployment Manager, select the organization, click Refresh, I get an error during the upgrade process
System.Exception: Error.ActionFailed Microsoft.Crm.Tools.Admin.InstallDatabaseUpdatesAction ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ComponentModel.Win32Exception: The specified module could not be found

Apparently, some kind of library is missing. There are no details in the Installation Log, in Event Log either.

The Internet points to SQL Server Native Client, but it is installed.

How to understand what the problem is?