Clean Unity’s Project Wizard in Unity 5.x on Windows 10

There are two ways to delete a project in the Unity’s project wizard. The first one is simply deleting, renaming or moving the directory directly from its location. The project wizard is smart enough and this is the recommended option.

The second one requires administrator privileges and deleting the registry entries associated with the projects we want to get rid of from the wizard’s list without deleting, moving or renaming the directories.
1 - Go to Windows registry (run regedit.exe).

2 - In the Windows registry, go to
HKEY_CURRENT_USER/Software/Unity Technologies/Unity Editor 5.x/

4- Find the entries which names begin with “RecentlyUsedProjectPaths-“. They’re numbered. If you click on the entry you can see your project path.

5- Select and delete the entries you want to get rid of.

Reference: This post is updated version of the solution from http://jorge.palacios.co/clean-unitys-project-wizard-in-unity-4-x/