If you are looking to verify or manually integrate these specific updates, the primary packages released in August 2018 include:
: A cumulative set of security and reliability updates.
: Subscribers often have access to various "refreshed" versions of Windows Server ISOs that include integrated updates.
: Security and quality updates for .NET versions 3.5 through 4.7.2. How to Obtain Integrated Media
Searching for a specific installation media that includes the August 2018 updates generally refers to "slipstreamed" or "integrated" ISO images. These versions are preferred by IT administrators to avoid the lengthy process of installing years of individual updates after a fresh OS installation. Key Update Details for August 2018
: Organizations with active licenses can download refreshed media directly from their portal. Important Lifecycle Notice Windows Server 2012 R2 | Microsoft Evaluation Center
: Focused strictly on security vulnerabilities.
: While primary downloads now focus on newer versions, you can still find Windows Server 2012 R2 Evaluation ISOs which may include some later rollups.