I just upgraded to version 3.0.1 from nunit 2.6.4. It used to have a NUnit Gui Runner, located here:

After installing 3.0.1 (which I downloaded windows version from here)
I now no longer see the nunit.exe in the installation folder, for example the directory structure is different and appears to be missing many files that were part of the previous installation:

For that purpose go to the File menu and select Open Project, now choose the Test case DLL or EXE file, and Unit Test case process is ready to execute as described in the following. NOTE: NUnit Software will only open the assembly (DLL or EXE) that are developed under Test Driven Project Methodology.
The nunit.exe program is a graphical runner. It shows the tests in an explorer-like browser window and provides a visual indication of the success or failure of the tests. It allows you to selectively run single tests or suites and reloads automatically as you modify and re-compile your code.
The NUnit team decided to make the GUI a separate product and will be releasing it separately. It is being rewritten from the ground up for NUnit 3, but hasn't been released yet. Development is happening on the GitHub page at https://github.com/nunit/nunit-gui if you want to get involved or track the progress. Initial releases will be out soon.
Update - There have been several preview releases of the new NUnit GUI that can be found at https://github.com/nunit/nunit-gui/releases. The previews are not recommended for production use, but they work and can be used.
The "final" release is here, you can find it at: https://github.com/TestCentric/testcentric-gui/releases
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