If you manage to find a safe download link, follow these steps to install it on a supported Mac:
If you visit Apple’s official download page today, you will only be offered iTunes 12.10.11 (or redirected to the Music app). Apple’s official support link structure for legacy iTunes has been deprecated. Searching for download itunes 101399 for mac 39link39 new often leads to dead FTP servers or malware-ridden ad sites. download itunes 101399 for mac 39link39 new
Warning: Do not trust random .dmg files from unknown forums without checking the cryptographic hash. Many "legacy iTunes" links have been injected with adware. If you manage to find a safe download
Because official Apple links for this version are dead (they redirect to modern iTunes), you must use a trusted archive community. Do not use random BitTorrent files. Instead: Install the Legacy Version:
Never download an exe or .dll file. On Mac, the correct extension is .dmg or .pkg.