Microsoft System CLR Types for SQL Server 2012: WSUS Download with Direct Compatibility Patch

To integrate Microsoft System CLR types into SQL Server 2012 via WSUS, you need the right WSUS-compatible download—and Microsoft’s official patch makes all the difference.

Missing this package often triggers CLR integration errors, leaving admins stuck between outdated downloads and compatibility headaches. Below, I’ll walk you through verified sources, step-by-step installation, and the fixes that actually work for SQL Server 2012 environments.

Where to download Microsoft System CLR Types for SQL Server 2012 with WSUS compatibility

As an IT admin managing SQL Server 2012 environments, you know CLR integration requires the Microsoft System CLR Types package. But locating the WSUS-compatible version with the correct compatibility patch can be tricky.

Microsoft doesn’t always bundle this with standard updates, forcing admins to hunt through archives or risk using mismatched versions. I’ve spent years deploying SQL Server in enterprise environments, and I’ll show you the fastest, most reliable ways to get this package—plus how to verify it’s WSUS-ready before deployment.

The Microsoft System CLR Types (also called SQLCLR) is a critical component for enabling Common Language Runtime support in SQL Server. Without it, stored procedures written in .NET languages will fail with errors like "CLR integration not enabled" or "assembly not found."

The challenge? Microsoft’s official SQL Server 2012 installation media often omits this package, and later service packs may not include it either. That’s why I recommend starting with the Microsoft Update Catalog—it’s the most reliable source for standalone updates and patches.

Here’s the key: the WSUS-compatible version of System CLR Types for SQL Server 2012 is typically found under KB2679874 or later cumulative updates. This patch includes the necessary CLR runtime components and is explicitly designed for WSUS distribution.

Always cross-reference the update description in the catalog to confirm it mentions SQLCLR support. Pro tip: Use the Update Catalog’s search filter for "SQL Server 2012" and "CLR" to narrow results.

Once you’ve downloaded the correct package from the Microsoft Update Catalog, you’ll need to verify its WSUS compatibility. Open the update’s properties in the catalog and check for a WSUS metadata file (.cab) included in the download.

This file contains the update classification (e.g., "Updates") and target platforms (e.g., "SQL Server 2012"). If missing, you’ll need to manually create a WSUS-compatible update using the Update Services Tools from Microsoft’s download site.

Deploying via WSUS is straightforward once you’ve confirmed compatibility. Start by uploading the package to your WSUS server using the Add Updates option in the console. Navigate to Updates → Right-click → Add and select the downloaded .msu or .msi file.

After upload, approve the update for your SQL Server 2012 target group. Remember to set the deadline and installation behavior (e.g., "Install this update as soon as possible").

For large enterprises, I recommend testing the update on a non-production SQL Server instance first. Common pitfalls include permission errors (ensure the SQL Server service account has access to the CLR runtime) and version conflicts (always check the SQL Server version in ssms → Help → About).

If you encounter issues, review the Windows Event Logs under Application → Microsoft SQL Server for CLR-related errors.

Pro tip: Use PowerShell to automate WSUS deployments for CLR types.

Common deployment errors and fixes for SQL Server 2012 CLR Types

Deploying Microsoft System CLR Types for SQL Server 2012 can fail unexpectedly due to permission issues, missing registry keys, or version mismatches. These errors often stem from incomplete installations or WSUS deployment misconfigurations. Understanding the root causes helps IT admins resolve issues faster and avoid production downtime.

One frequent issue is the CLR integration failure when SQL Server cannot find the required CLR runtime components. This often happens if the Microsoft System CLR Types package isn’t properly registered in the GAC (Global Assembly Cache).

Another common problem is permission errors during deployment, especially in environments where WSUS enforces strict security policies.

For version mismatches, ensure you’re deploying the correct SQL Server 2012 SP3 compatibility patch. Older versions of Microsoft System CLR Types may not work with later service packs. Always cross-reference the patch version with your SQL Server installation media or Microsoft’s official Update Catalog.

If WSUS deployment fails, check the WSUS approval status for the CLR Types update. Sometimes, the update gets stuck in the pending approval state, preventing clients from downloading it. Log in to your WSUS console and manually approve the update under Updates > All Updates.

To fix permission issues, run the deployment as an administrator and ensure the SQL Server service account has full access to the CLR Types installation directory. Use the icacls command to grant permissions if needed. For example: icacls "C:\Program Files\Microsoft SQL Server\CLR Types" /grant "NT Service\MSSQLSERVER":F

Finally, always test deployments in a staging environment before rolling out to production. Use SQL Server Configuration Manager to verify CLR integration by checking the CLR Enabled property under SQL Server Services. If enabled, your deployment was successful.

Frequently asked questions