Step 1: r2Modman

https://thunderstore.io/package/ebkr/r2modman/

Click "Manual Download" on Thunderstore.
Inside the downloaded .zip file. Run the "r2modman Setup X.X.X.exe" (where X.X.X is the current version).
Follow the steps in the installer.

Step 2: Install modpack

https://thunderstore.io/c/lethal-company/p/MikeZilla/ModsMikeisUsing/

Click "Install with Mod Manager" button

Step 3: Done

Launch through r2modman to play modded.
Maybe change your settings when you're in game