Removing your Assets from the Asset Store

To disable an assetsAny media or data that can be used in your game or Project. An asset may come from a file created outside of Unity, such as a 3D model, an audio file or an image. You can also create some asset types in Unity, such as an Animator Controller, an Audio Mixer or a Render Texture. More info
See in Glossary that you have successfully published to the Asset StoreA growing library of free and commercial assets created by Unity and members of the community. Offers a wide variety of assets, from textures, models and animations to whole Project examples, tutorials and Editor extensions. More info
See in Glossary, email assetstore@unity3d.com with the following:

• Publisher name
• Asset name
• Confirmation that you want to disable the asset(s) stated

The request must be sent from the email address attached to the publisher account of the asset(s) you want to disable.