Download the demoPress “Download demo” on the match page to get a .dem file. If you downloaded the archive, unpack it.
Put the file into the game folderCopy the .dem file into:Steam\steamapps\common\Counter-Strike Global Offensive\game\csgoQuick way: Steam → Library → right-click Counter-Strike 2 → Manage → Browse local files → game → csgo.
Enable the consoleIn CS2: Settings → Game → “Enable Developer Console (~)” → Yes. Only once.
Start the demoOpen the console with ~ and paste the command:playdemo file_name
Control playbackShift + F2 opens the playback panel: pause, seek, speed. To leave, type disconnect in the console.