In the wiki is just some info for the Boyzz that do use the modpack that I don't know.

How to install Thunderstore App

• Go to this website and click on Get App Click here

• Open the installer that got downloaded
• Click on Yes

• Select the language you want to use and then Next

• Click Accept and then Next (After you have read everything, of course)

• Just click on Next
• Click on Accept & Install

• Click on Launch

• Search the game, if you use Thunderstore only for Lethal Company click Set as default

• Click on Select profile

• Follow the steps below to install the modpack "For The Boyzz"

How to install the modpack "For The Boyzz"

• Open this link: For The Boyzz
• Click on Install with Mod Manager

• Click on the popup on Open

• Now the mods will be installed, you will be able to update the mods through the mod manager.