ILSpy is an assembly browser and decompiler. Here we will go through installing and using ILSpy.
First, download the binaries from the ILSpy website:

This will download a ZIP file.
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Extract the file:

Run the ISpy.exe:

Click to open a file:

Here I have selected an exe compiled from code I previously wrote. You can see we can now see the decompiled code within ILSpy:

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