You have to uncheck it manually in the launcher. The files won't be deleted from the data folder, but updates for the mod aren't downloaded anymore. Selecting Subscribed items will display a list of mods you are subscribed to.

Go into the Steam client and log into Community.

Unsubscribing from a mod can be done in two ways: Every time the Skyrim launcher is started, it will automatically download the latest version of any subscribed mods.

Players can directly subscribe to the mods from the Steam Workshop. This allows players to quickly install new mods. Mods can be directly uploaded from the Creation Kit to the Steam Workshop. Creation Kit EULA - The end-user license agreement for the software.Creation Kit Wiki - Official wiki for the Creation Kit where you can find details and tutorials for creating mods.It also integrates with the Steam Workshop to allow users to share, rate, and download mods. With the help of third-party engines, it can also change GUI elements such as making a PC-friendly items menu. The Creation Kit is a program that can be used to control nearly any aspect of the game or create mods, capable of adding brand new user-created game content, examining the game data and retexturing the game. Instruction for installing the CK version for the Skyrim Special Edition and Creation Club content can be found at the Creation Kit Wiki. As of 2018, you must get into Library > Tools in Steam, then use the search feature for 'Creation' in that section the tool is no longer listed otherwise. Moreover, it is only available on the PC, as console manufacturers do not allow third-party content to run on users' systems. However, the download (approximately 81MB in size) is only visible to users who have already bought the game.

It can be located on Steam under Library > Tools > Skyrim Creation Kit. The Creation Kit is available for download through Steam and its current version is v1.9.36.0.

The Creation Kit is an external program that is run separately from the game of Skyrim. The tool was released on 7 February 2012, along with the High Resolution Texture Pack. The Creation Kit or CK (known in previous TES games as the Construction Set or CS) is a tool that can be used to view and edit the game's data files.

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