From the author's README on Thunderstore

Young 1 Pact T-shirt pack for ReSkate.

Installation

ReSkate Launcher / Thunderstore

Install the ZIP through the ReSkate Launcher or a Thunderstore-compatible mod manager, then launch skate. through ReSkate.

Manual

Extract the contents directly into its own folder inside:

skate.\Mods\Young_1_Pact\

The native ReSkate files (layout.toc, initfs_win32, Win32, etc.) should remain at the root of the mod folder.

Requirements

skate. on PC
ReSkate / ReSkate Launcher

Version

1.0.0 — Initial release.

Install Young 1 Pact

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

Open ReSkateLauncher.exe and go to MODS.
Search for Young 1 Pact 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.