Download VERIFIED .net Framework 4.8 Runtime

To be able to investigate an issue reported for one of my apps, I need to know the (runtime) environment in which my application runs on the user's side. Besides application's version and operating system's version, I also want to display the .NET CLR version and (if possible) the .NET Framework version to the user so the user can report these information back to me.

This article provides help to mitigate an issue when after installing the June 13, 2023, updates for .NET Framework and .NET, users may experience issues with how .NET Framework runtime imports X.509 Certificates.

Download .net Framework 4.8 Runtime

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Runtime issues are those that arise when a new runtime is placed on a machine and an app's behavior changes. When running on a newer version than what was targeted, .NET Framework uses quirked behavior to mimic the older targeted version. The app runs on the newer version but acts as if it's running on the older version. Many of the compatibility issues between versions of .NET Framework are mitigated through this quirking model. For example, if a binary was compiled for .NET Framework 4.0 but runs on a machine with .NET Framework 4.5 or later, it runs in .NET Framework 4.0 compatibility mode. This means that many of the changes in the later version don't affect the binary.

In the articles that describe runtime and retargeting changes, for example, Retargeting changes for migration to .NET Framework 4.8.x, individual items are classified by their expected impact as follows:

There's a ".NET Runtime" and a ".NET Desktop Runtime" - please ensure you've installed the ".NET Desktop Runtime" and not the other. The .NET Desktop Runtime 6.0.6 installer can be found here: -us/download/dotnet/thank-you/runtime-desktop-6.0.6-windows-x64-insta...

Developers use the .NET Framework to create Windows desktop and server-based applications. This includes ASP.NET web applications. On the other hand, .NET Core is used to create server applications that run on Windows, Linux and Mac. It does not currently support creating desktop applications with a user interface. Developers can write applications and libraries in VB.NET, C# and F# in both runtimes.

A cross-platform and open-source framework, .NET Core is best when developing applications on any platform. .NET Core is used for cloud applications or refactoring large enterprise applications into microservices.

You can install .NET Framework 4.8.1 from our .NET Framework Download site. For building applications targeting .NET Framework 4.8.1, you can download the NET Framework 4.8.1 Developer Pack. If you just want the runtime, you can use either:

The fact that I read earlier that Microsoft was going to upgrade the WebForms Visual Designer combined with this new version of the .NET Framework makes it appear that many developers and organizations are still working with the original frameworks and intend to stay with them.

Not all fatal errors in .NET Framework runtime will be caused by same issue, which is to say just because you observe "A fatal error occurred in .NET Framework runtime", it doesn't mean it's the same issue as described in this article. This is a generic message indicating the .NET Framework runtime failed.

This may sound slightly convoluted so I'll try and describe my problem as clearly as possible.

Recently, I noticed I had an older program called Microsoft Windows Desktop Runtime 5.0.10 (x86), and Microsoft recommended updating to Microsoft Windows Desktop Runtime 6.0.12 (x86), so I uninstalled the program. I was notified during the uninstall process that Kaspersky is dependant on this runtime to function, but I thought, that's okay as I will be installing the latest version of this Runtime. I promptly installed Microsoft Windows Desktop Runtime 6.0.12 (x86), but Kaspersky ceased to function and I received this:

The .NET Framework (pronounced as "dot net") is a proprietary software framework developed by Microsoft that runs primarily on Microsoft Windows. It was the predominant implementation of the Common Language Infrastructure (CLI) until being superseded by the cross-platform .NET project. It includes a large class library called Framework Class Library (FCL) and provides language interoperability (each language can use code written in other languages) across several programming languages. Programs written for .NET Framework execute in a software environment (in contrast to a hardware environment) named the Common Language Runtime (CLR). The CLR is an application virtual machine that provides services such as security, memory management, and exception handling. As such, computer code written using .NET Framework is called "managed code". FCL and CLR together constitute the .NET Framework.

FCL provides the user interface, data access, database connectivity, cryptography, web application development, numeric algorithms, and network communications. Programmers produce software by combining their source code with .NET Framework and other libraries. The framework is intended to be used by most new applications created for the Windows platform. Microsoft also produces an integrated development environment for .NET software called Visual Studio.

In April 2019, Microsoft released .NET Framework 4.8, the last major version of the framework as a proprietary offering, followed by .NET Framework 4.8.1 in August 2022. Only monthly security and reliability bug fixes to that version have been released since then. No further changes to that version are planned. The .NET Framework will continue to be included with future releases of Windows and continue to receive security updates, with no plans to remove it as of November 2023.[3]

While Microsoft and their partners hold patents for CLI and C#, ECMA and ISO require that all patents essential to implementation be made available under "reasonable and non-discriminatory terms". The firms agreed to meet these terms, and to make the patents available royalty-free. However, this did not apply to the part of the .NET Framework not covered by ECMA-ISO standards, which included Windows Forms, ADO.NET, and ASP.NET. Patents that Microsoft holds in these areas may have deterred non-Microsoft implementations of the full framework.[8]

In November 2014, Microsoft also produced an update to its patent grants, which further extends the scope beyond its prior pledges. Prior projects like Mono existed in a legal grey area because Microsoft's earlier grants applied only to the technology in "covered specifications", including strictly the 4th editions each of ECMA-334 and ECMA-335. The new patent promise, however, places no ceiling on the specification version, and even extends to any .NET runtime technologies documented on MSDN that have not been formally specified by the ECMA group, if a project chooses to implement them. This allows Mono and other projects to maintain feature parity with modern .NET features that have been introduced since the 4th edition was published without being at risk of patent litigation over the implementation of those features. The new grant does maintain the restriction that any implementation must maintain minimum compliance with the mandatory parts of the CLI specification.[11]

Common Language Infrastructure (CLI) provides a language-neutral platform for application development and execution. By implementing the core aspects of .NET Framework within the scope of CLI, these functions will not be tied to one language but will be available across the many languages supported by the framework.

Because computer systems commonly require interaction between newer and older applications, .NET Framework provides means to access functions implemented in newer and older programs that execute outside .NET environment. Access to Component Object Model (COM) components is provided in System.Runtime.InteropServices and System.EnterpriseServices namespaces of the framework. Access to other functions is via Platform Invocation Services (P/Invoke). Access to .NET functions from native applications is via the reverse P/Invoke function.

While Microsoft has never implemented the full framework on any system except Microsoft Windows, it has engineered the framework to be cross-platform,[23] and implementations are available for other operating systems (see Silverlight and Alternative implementations). Microsoft submitted the specifications for CLI (which includes the Base Class Libraries, CTS, and CIL),[24][25][26] C#,[5] and C++/CLI[27] to both Ecma International (ECMA) and International Organization for Standardization (ISO), making them available as official standards. This makes it possible for third parties to create compatible implementations of the framework and its languages on other platforms.

.NET Framework includes a garbage collector (GC) which runs periodically, on a separate thread from the application's thread, that enumerates all the unusable objects and reclaims the memory allocated to them. It is a non-deterministic, compacting, mark-and-sweep garbage collector. GC runs only when a set amount of memory has been used or there is enough pressure for memory on the system. Since it is not guaranteed when the conditions to reclaim memory are reached, GC runs are non-deterministic. Each .NET application has a set of roots, which are pointers to objects on the managed heap (managed objects). These include references to static objects, objects defined as local variables or method parameters currently in scope, and objects referred to by CPU registers.[30] When GC runs, it pauses the application and then, for each object referred to in the root, it recursively enumerates all the objects reachable from the root objects and marks them as reachable. It uses CLI metadata and reflection to discover the objects encapsulated by an object, and then recursively walk them. It then enumerates all the objects on the heap (which were initially allocated contiguously) using reflection. All objects not marked as reachable are garbage.[30] This is the mark phase.[31] Since the memory held by garbage is of no consequence, it is considered free space. However, this leaves chunks of free space between objects which were initially contiguous. The objects are then compacted together to make free space on the managed heap contiguous again.[30][31] Any reference to an object invalidated by moving the object is updated by GC to reflect the new location.[31] The application is resumed after garbage collection ends. The latest version of .NET framework uses concurrent garbage collection along with user code, making pauses unnoticeable, because it is done in the background.[32] e24fc04721