Legacy Update: Get back online, activate, and install updates on your legacy Windows PC

Update to .NET Framework 3.5 SP1 for the .NET Framework Assistant 1.0 for Firefox is required to address several compatibility issues with version 1.0 of the extension.

• In .NET Framework 3.5 SP1, the .NET Framework Assistant enables Firefox to use the ClickOnce technology that is included in the .NET Framework. The .NET Framework Assistant is added at the machine-level to enable its functionality for all users on the machine. As a result, the Uninstall button is shown as unavailable in the Firefox Add-ons list because standard users are not permitted to uninstall machine-level components. In this update for .NET Framework 3.5 SP1 and in Windows 7, the .NET Framework Assistant will be installed on a per-user basis. As a result, the Uninstall button will be functional in the Firefox Add-ons list.This update will also make this version of the .NET Framework Assistant for Firefox compatible with future versions of the Firefox browser. To properly update the .NET Framework Assistant, this update must be applied while the extension is enabled in Firefox. To remedy the result of installing this update while the extension was disabled, uninstall the update, re-enable the extension, and reinstall the update.Updates to the .NET Framework Assistant may include updates to the Windows Presentation Foundation Plug-in for Firefox causing it to be enabled upon its initial update.

Files

Status: Deleted This 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	SHA1 Hash	Size
NDP35SP1-KB963707-x64.exe	bc1484973c605be1204e97ef69e9c02e54568fe3	722 KB
NDP35SP1-KB963707-x86.exe	301b6cf8eaf5d2212895fcd9fc566414fb033e3e	722 KB

• • Supported .NET Framework Version: .NET Framework 3.5 Service Pack 1
  • Processor: 400 MHz Pentium processor or equivalent (Minimum); 1GHz Pentium processor or equivalent (Recommended)
  • RAM: 96 MB (Minimum); 256 MB (Recommended)
  • Hard Disk: Up to 500 MB of available space may be required
  • CD or DVD Drive: Not Required
  • Display: 800 x 600, 256 colors (Minimum); 1024 x 768 high color, 32-bit (Recommended)

• 1. Important: This fix requires that .NET Framework 3.5 SP1 be installed before it can be applied. Please read the release notes for known issues with .NET Framework 3.5 SP1 before you install the service pack. Make sure you have the latest service pack and critical updates for the version of Windows on the computer. To look for recent updates, visit Windows Update. In addition, make sure you have Windows Installer 3.1 installed before you install this service pack.
  
  2. Click the Download button on this page to start the download.
  
  3. To save the download to your computer for installation at a later time, click Save.
  
  4. To cancel the installation, click Cancel.
  
  IMPORTANT: After installing the .NET Framework 3.5 SP1 package (either the bootstrapper or the full package) you should immediately install the update KB959209 to address a set of known application compatibility issues.