Win10 installs .Net Framework 3.5 sp1

SP1 is a collection of packages with patch package functions produced by Microsoft, which is equivalent to a major system upgrade package.

Right -click [Windows Label] (Recommended Learning: PHPSTORM )

Click [Function and Application]

Now window10 will enter the interface as shown in the picture, scroll to the bottom and click [Apps and Programs]

Click [Enable Or turn off Windows functions】

Then check the icon option as shown below

## Finally click [OK], and then wait for the system to complete the installation!

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