If you can't find Vanguard or Battlenet within Windows Defender Firewall's allowed app settings, click the Allow another app button. Then click Browse to select Vanguard or Battle, and press the Open and Add buttons. After adding those apps, you can configure their firewall settings as outlined above.

The best and easiest way to get free skins in CS:GO is to have the Prime status upgrade to your account. Surely, you have to pay for it first, but it will multiply your investments indefinitely as long as you play, play and play! Prime's profile levelling system is what gives you free skins.

Level up each week. One of the easiest ways to earn free skins in CS:GO is to just play the game. You get a loot drop after your first level-up each week. This is usually a drop containing skins.