читати інструкцію пробував? http://ts3overlay.r-dev.de/
Installation instructions:
The plugin is already included in the TS3 Client distribution.
You may however d/l the latest stable (or development version) from the download section.
In this case, try to get the setup (the executable). It will automatically detect the installation location and determines if 32bit or 64bit is required
If you decide to download one of the RAR archives, you need to extract the archive's content to your TS3 installation's plugins folder.