If you know which files were replaced (often resident.rpf or weapons_player.rpf ), navigate to your GTA V/x64/audio/sfx folder, delete those specific files, and then run the Verify Integrity check mentioned in Step 1. The launcher will only download the missing files. Why this happens
If you kept a backup of your original x64/audio/sfx folder before installing the pack, navigate to your GTA V installation directory (e.g., Program Files/Epic Games/GTA/x64/audio/sfx ) and drag your backup files into that folder, selecting Replace all files . Fivem - How to Remove Sound Pack
The most reliable way to remove a sound pack is to let your game launcher detect the "corrupted" (modified) files and download the originals. If you know which files were replaced (often resident