Microsoft Download Center Archive
 | Security Update for Microsoft .NET Framework 4.5.1 and .NET Framework 4.5.2 on Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 |
A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it.
- A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it. You can help protect your system by installing this update from Microsoft. After you install this update, you may have to restart your system.
| Knowledge Base Articles: | |
|---|---|
| Security Bulletins: |
Files
 | Status: DeletedThis download is no longer available on microsoft.com. The downloads below are archives provided by the Internet Archive Wayback Machine from the Microsoft Download Center prior to August 2020. |
| File | Size |
|---|---|
 Windows8.1-KB2978126-arm.msuSHA1: 6c9284960ae0b877def9f8335499d8fa22bed1d0 | 505 KB |
| Windows8.1-KB2978126-x64.msu SHA1: 2d0507307c8873fefbfd0d236c2956f7bf03eaf8 | 727 KB |
| Windows8.1-KB2978126-x86.msu SHA1: 7781fac873bfaf65e7bdb7d4327e5c96d8143d83 | 636 KB |
System Requirements
Operating Systems: Windows 8.1, Windows RT 8.1, Windows Server 2012 R2
Note: More information about Service Pack levels currently supported for the platforms listed above can be found in the following page: Microsoft Product Support Lifecycle.
Installation Instructions
- Click the Download button on this page to start the download, or select a different language from the Change language drop-down list and click Change.
- Do one of the following:
- To start the installation immediately, click Run.
- To save the download to your computer for installation at a later time, click Save.
- To cancel the installation, click Cancel.