Hello LL_EL,
Unfortunately iTunes 12 requires Windows 7 or higher:
Software:
- Windows 7 or later
- 64-bit editions of Windows 7 and Windows 8 require the iTunes 64-bit installer; for more information, visit www.itunes.com/download
- 400MB of available disk space
- Screen reader support requires Window-Eyes 7.2 or later; for information about accessibility in iTunes, visit www.apple.com/accessibility
- iTunes is now a 64-bit application on 64-bit versions of Windows 8 and 7. Some third-party visualizers may no longer be compatible with this version of iTunes. Please contact the developer for an updated visualizer that is compatible with iTunes 12.1 or later
- Apple Music, Apple Music Radio, iTunes in the Cloud, and iTunes Match availability may vary by country
However you can try downloading a older version that may still be more up to date from: https://support.apple.com/downloads/itunes
I hope this helps.