[igorzeni]

I would like to know if there is a possibility of making a plugin where it saves all the player demos in a folder within the server or somewhere that I can download without having to request a demo

[fysiks]

You cannot access players' files. They must send the files to you.

[DenisB29]

You can only make this by using HLTV, connecting to your server and recording every game.
This way, you have ONE demo for every player (like eSports demos)

Like fysiks told you, you can't acces player's files .