Move the plugin files to your system's default plugin directory: C:\Program Files\Common Files\VST3 Mac VST3: /Library/Audio/Plug-Ins/VST3 Mac AU: /Library/Audio/Plug-Ins/Components
Stick to or official UA giveaways for the best performance and security. To help you get the best sound, tell me: What DAW are you using (Ableton, FL Studio, Logic)? Are you mixing vocals, bass, or something else ? Do you prefer a clean sound or a vintage/gritty one?