Navigate to your game directory. For example, in Left 4 Dead 2 , the core VPKs are in /left4dead2/ . Right-click the VPK you want (e.g., pak01_dir.vpk — note: this is usually huge, so use a smaller addon VPK first ) and copy it to your desktop.
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Go to your chosen tool. You should see a box that says "Drop VPK file here or click to upload." Navigate to your game directory