From the author's README on Thunderstore

Nike Air Mag — skate.

The iconic Nike Air Mag from Back to the Future Part II ported to skate.!

👟 Features

Clean high-top silhouette with authentic shape and straps
Glowing sole lights & turquoise MAG branding
Replaces/adds to the footwear wardrobe
Fully skate-tested: looks clean with shorts, loose pants, and hoverboards

📦 Installation

Via Thunderstore / r2modman (Recommended)

Install this mod via r2modman or the Thunderstore App.
Click Start Modded.

Manual Installation

Extract this zip file.
Put the Nike_Air_Mag.fbmod file into your ReSkate mods folder (skate/Mods/).
Launch the game using your ReSkate loader.

🛹 In-Game

Equip the shoes under Customizer > Footwear / Shoes.

👥 Credits

Original model ported from Fortnite
Mesh cleaning, shape key baking, and Frostbite routing by Eli_Mannning using Blender & ReSkate Studio

Install Nike Air Mag

You need ReSkate and your own copy of skate. on Steam.

Open ReSkateLauncher.exe and go to MODS.
Search for Nike Air Mag and click install. The launcher also installs anything it depends on.
Press PLAY. In game, the MODS tab of the ReSkate menu (Insert) turns it on and off.

Or install it by hand: download the .zip and drop it on the launcher window, or unzip it into its own folder in Mods\ beside Skate.exe.

Maps show up in the ReSkate menu's level list. To join a server running a custom map, you need the same map installed. If the game won't load after installing, see known issues.

skatemods doesn't host or review this mod. The download comes straight from Thunderstore. Only install mods you trust, because scripts can run code.