Crucially, users should avoid third-party download sites that promise "free" versions, as iTunes is already free. Unofficial sites often bundle the installer with adware or bloatware, which can compromise system performance and security.
from Apple. You should only download it from Apple’s official website to avoid malware or unwanted software. itunes free download windows 10
The Microsoft Store on Windows 10. (Open the Store app, search "iTunes," and click "Install" – this version is also free and updates automatically). itunes free download windows 10