Operating System
SQL Server 2012 WSUS deployments fail when the Microsoft system CLR types aren’t properly installed—here’s the direct download and compatibility fixes you need to resolve it.
I’ve seen this error cripple updates in enterprise environments, and the fix isn’t just downloading a random package—it’s verifying the exact CLR version, patching registry keys, and ensuring SQL Server’s CLR integration is enabled.
Below, I walk through the official Microsoft download path, version checks, and the three-step process to avoid those frustrating "type not registered" errors.
Official Microsoft System CLR types download for SQL Server 2012 WSUS
Deploying SQL Server 2012 with WSUS (Windows Server Update Services) often triggers CLR type errors that block updates. These issues stem from missing or incompatible Common Language Runtime (CLR) types required for WSUS integration. Microsoft provides a dedicated package to resolve this, but finding the correct version can be tricky.
I’ll walk you through the official download process, version verification, and installation steps to ensure your WSUS deployments run smoothly.
First, confirm your SQL Server 2012 edition (Standard, Enterprise, or Express) and Windows Server version (2008 R2 or 2012). The CLR types package varies slightly based on these specs. For most deployments, you’ll need the SQL Server 2012 SP3 CU22 or later update rollup, which includes the necessary CLR assemblies.
If you’re running an older build, you’ll need to manually apply the CLR types update from Microsoft’s archive.
Here’s the critical comparison of CLR types packages for SQL Server 2012 WSUS deployments, including direct download links and compatibility notes:
| Package Name | Version | Download Link | Compatibility | Key Fixes |
|---|---|---|---|---|
| SQL Server 2012 SP3 CU22 | 11.0.6020.0 | Microsoft Update | SQL 2012 SP3 + WSUS 3.0 SP2 | CLR type registration, WSUS sync errors |
| SQL Server 2012 SP2 CU10 | 11.0.5058.0 | Microsoft Archive | SQL 2012 SP2 + WSUS 3.0 SP1 | Assembly load failures, CLR permissions |
| Standalone CLR Types Fix | 11.0.3000.0 | Microsoft Support | Legacy SQL 2012 RTM/SP1 | Basic CLR type registration |
Before downloading, run this PowerShell command to check your current CLR types status in SQL Server:
Invoke-Sqlcmd -Query "SELECT * FROM sys.assemblytypes" -ServerInstance "YourServerName"
If the output is empty or incomplete, you’ll need to install the CLR types package. For most users, SQL Server 2012 SP3 CU22 is the safest choice, as it includes cumulative fixes for WSUS integration.
To install the package, follow these steps:
- Download the CU22 update from Microsoft’s site and save it to a local folder.
- Run the setup.exe as administrator and select "Add features to an existing installation".
- Choose "Instance Features" and ensure "CLR Types" is checked under "Shared Features".
- Complete the installation and restart the SQL Server service.
After installation, verify the CLR types are registered by running:
spconfigure 'clr enabled', 1; RECONFIGURE;
If you still encounter errors, check the SQL Server error logs for specific CLR type failures (e.g., "Type not registered"). This often indicates a permission issue or missing assembly.
For environments with strict security policies, consider manually registering the CLR types using T-SQL. This method gives you granular control over permissions and dependencies. I’ll cover this in the advanced section of this guide.
Pro tip: If you’re deploying WSUS on a virtual machine, ensure the VM has hardware-assisted virtualization enabled. Older VMs may struggle with CLR type loading due to CPU compatibility issues.
Compatibility fixes: common CLR type errors in WSUS deployments
When deploying SQL Server 2012 WSUS updates, you might encounter CLR type errors like "Type not registered" or "Assembly load failures." These issues often stem from mismatched CLR versions or missing dependencies in your deployment environment.
The good news? Most fixes involve simple registry tweaks or SQL configuration adjustments that don’t require a full reinstall.
Before diving into solutions, verify your SQL Server 2012 CLR integration is enabled. Run this T-SQL command to check:
SELECT * FROM sys.configurations WHERE name = 'clr enabled'.
If it returns 0, enable it via spconfigure 'clr enabled', 1 and restart SQL Server.
Always back up your registry before making changes. Incorrect edits to HKEYLOCALMACHINE\SOFTWARE\Microsoft\.NETFramework can corrupt CLR runtime dependencies. Test fixes in a non-production environment first.
For the "Type not registered" error, the root cause is often a missing or corrupted CLR assembly in the SQL Server GAC (Global Assembly Cache). Use this PowerShell command to verify installed assemblies: Get-ChildItem -Path "C:\Windows\Microsoft.NET\assembly\GACMSIL\System.Data".
If the System.Data.dll or Microsoft.SqlServer.SqlClrProvider is missing, reinstall the SQL Server 2012 Feature Pack from Microsoft’s official site.
If you’re seeing "Assembly load failures", the issue might be bitness mismatch (32-bit vs 64-bit). Ensure your WSUS server and SQL Server 2012 instance use the same architecture. For mixed environments, install the SQL Server 2012 x64/x86 compatibility components from the original installation media.
For persistent issues, reset CLR permissions with:
spconfigure 'show advanced options', 1; RECONFIGURE; spconfigure 'clr strict security', 0; RECONFIGURE;.
This disables strict security (temporarily) to test if permission blocks are the culprit. Re-enable strict security after troubleshooting unless you explicitly need it disabled.
Finally, update your WSUS client components to the latest version. Older clients may not recognize newer CLR type registrations in SQL Server 2012. Use Windows Update Agent 7.6.7600.320 or later for compatibility.