Download the imamge for a better view of the skins: https://www.mediafire.com/file/qcekj1dxpa9cf3m/Squid_Game_Skin_Pack__All_Skins.png/file
Download Link: https://www.mediafire.com/file/e4vqs78xx4ykq5f/Squid_Game_Skin_Pack_Unzip_Me%2521.zip/file
How to install for Windows:

You open the download link
You unzip the downloaded zip file
You open Minecraft Launcher (Don't open Minecraft)
You click on Skins
You click on New Skin
You click on Browse Skin File
You open the unzipped file
You select a skin file and click on Done
If you don't like the skin then you can choose another skin file

How to install for Mac:

You open the download link
You unzip the downloaded zip file
You open Minecraft Launcher (Don't open Minecraft)
You click on Skins
You click on New Skin
You click on Browse Skin File
You open the unzipped file
You select a skin file and click on Done
If you don't like the skin then you can choose another skin file