Hardnox 4.2 is a new Kodi Build for Leia 18 from Misfit Mods Wizard. It uses Aeon Nox Silvo skin and it has size of 275 MB.

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Steps to Install Hardnox Kodi 18 Leia Build
Step 1) From home screen go to Settings

Step 2) Click File Manager

Step 3) Click Add Source

Step 4) Click None

Step 5) Enter the following address: http://misfitmods.com/mmwiz/repo/

Step 6) Name it misfit

Step 7) The boxes should match the picture below

Step 8) Go back to Home screen and click add-ons

Step 9) Click the add-on browser from the top left

Step 10) Click Install from zip file

Step 11) A box will open click misfit

Step 12) Click plugin.program.misfitmods-1.4.zip

Step 13) Wait for the top right to popup Misfit Mods Wizard Installed

Step 14) It will pop up a information message click Dismiss

Step 15) Click Continue

Step 16) Click Build Menu

Step 17) Click Hardnox 4.2

Step 18) Click Fresh Install or Standard Install (Fresh Install is usually bests)

Step 19) Click Yes to Install

Step 20) It will download and install

Step 21) Click force close

Step 22) After it installs restart Kodi and it should come up. Be sure to give it time to build menus and update add-ons.

How to change the Skin back to Default Estuary
If this Build does not work for you here is how to change the Skin back to default Estuary and remove it.
Step 1) From home screen go to Setting

Step 2) Click Interface Settings

Step 3) Click Skin

Step 4) Click Estuary

Step 5) Click Yes