You can check by opening the Turn Windows features on or off dialog as described in Method 1. If the checkbox for ".NET Framework 3.5 (includes .NET 2.0 and 3.0)" is checked, it is installed.
By November 2007, Microsoft released . It wasn't just a new version; it was a cumulative stack. To ensure everything worked perfectly, the 3.5 installer was designed to automatically include and install: .NET Framework 2.0 SP1 (the core engine) .NET Framework 3.0 SP1 (the UI and communication layers)
If you are running an older app that demands these "legacy" versions, you don't need three separate downloads. You can find the (the offline installer) directly from the Official Microsoft Download Center.
If you have downloaded the full offline installer (dotnetfx35.exe) directly from Microsoft: net framework 35 includes net 20 and 30 download link
Understanding .NET Framework 3.5: Why It Includes 2.0 and 3.0 (Plus Download Guide)
Microsoft built .NET Framework 3.5 as a cumulative layer directly on top of its predecessors.
If you have the Windows installation ISO or USB drive mounted as drive D: , use the DISM tool: You can check by opening the Turn Windows
added features like LINQ and new language enhancements, but still relied on CLR 2.0.
However, .NET Framework 3.5 is unique because it is a "cumulative" package. Here is everything you need to know about why you need it and how to get it correctly. Why .NET 3.5 is Special: It Includes 2.0 and 3.0 The most important thing to understand is that .NET Framework 3.5 includes version 2.0 and 3.0
Microsoft designed .NET Framework 3.5 as an to versions 2.0 and 3.0, not a replacement. When you install version 3.5, you get: It wasn't just a new version; it was a cumulative stack
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs Use code with caution.
introduced the core CLR 2.0 engine and base class libraries.