On Macbook pro, What itune version can I download in order to sync with my ipad?

The iTunes app for Macs was discontinued and replaced; it cannot be installed on Macs that are running Catalina, Big Sur or Monterey. See: What happened to iTunes? - Apple Support

Use Finder to sync with an iPad. See: Use the Finder to sync your iPhone, iPad, or iPod with your computer - Apple Support

Finder is on your Mac. It's what you use to access all files and folders on your Mac. Also see: Get to know the Finder on your Mac - Apple Support