If you are running macOS High Sierra (10.13), iTunes is included with the system, but you may need to update it.
Are you seeing a when you try to open iTunes? macOS High Sierra - App Store - Apple itunes macos 10.13.99 download
You can obtain the correct version for your Mac through the following official channels: Download iTunes 12.8.3 for Mac - Apple Support Download iTunes 12.8. 3 for Mac - Apple Support. Apple Support Download macOS High Sierra 10.13.6 Update - Apple Support If you are running macOS High Sierra (10