KB4511555 for .NET Framework 3.5, 4.8 Windows 10 19H1 – 30 Aug 2019

Microsoft rolls cumulative update KB4511555 for .NET Framework 3.5,4.8 for Windows 10 19H1 and Windows Server to all users. Further, we suggest implementing this update to increase the reliability improvements as part of your regular maintenance routines. Moreover, the new update offers bug fixes and enhancements to make Windows 10 more secure.

This update is specially designed for the purpose of security issue which aims to protect your system more accurately. Furthermore, It also protects the PC when you are installing the latest update. Before installing this update, you may check the Prerequisites and Restart requirement sections. Besides, here is the complete catalog of  Windows 10 cumulative updates.


Quality and reliability improvements

Here are the key features that came along with the KB4511555 cumulative update.

Bass Class Library (BCL)Resolves a crash that arises often after enumerating event logs.
Windows Presentation Foundation (WPF)
  • Works upon a regression that occurs due to a bug involving bindings with DataContext explicitly on the binding path.
  • KB4511555 addresses a handle leak during the creation of a Window in WPF applications that are manifested for Per Monitor DPI V2 Awareness. This leak may let extraneous GC. Collect calls that can affect performance in Window creation scenarios.
  • Resolves a crash that occurs due to ArgumentNullException while loading a DataGrid (containing a ComboBox) and automation is active.  For instance, when you browse Visual Studio from Text Editor\C#\Code Style > Naming page in ToolsOptions.
Windows Forms
  • Addresses an issue involving interaction between WPF user control and hosting a WinForms app when processing keyboard input.
  • Enables the ability to select ComboBox edit field text by using mouse down+move.
  • Addresses an anomaly that affects  Narrator/NVDA announcing PropertyGrid ComboBox expanding and collapsing action.
  • Works upon an issue that affects rendering ellipses (…) button of PropertyGrid control in HC mode to draw button background and dots as contrasted.
ASP.NETWorks upon System.Web.Caching initialization bug that occurs while using ASP.NET cache on computers without IIS. 

How to install KB4511555 for .NET Framework 3.5, 4.8

You will auto-receive a notification regarding .NET Framework 3.5, 4.8 from the Windows Update section. However, you may download the same manually as well. Here’s how to proceed.

Step-1: At first, press Win + I to invoke the Settings app.

Step-2: Thereupon, click Update & Security followed by Windows Update on the next page.

Step-3: Henceforth, switch to the right side and tap Check for updates button. 

Alternatively, you may download the standalone package though the Update Catalog

A few Prerequisites 

  • To apply this update, you must have .NET Framework 3.5 or 4.8 installed.
  • You must reboot your PC after applying this update so as to discard any files that are not being used. You should exit all .NET Framework-based apps before downloading this patch update.

Source – Microsoft Update Catalog