Once installed, you will notice the icon in the top-left dropdown menu (next to Music, Movies, etc.). To confirm you have the correct version:
You cannot install 12.6.5.3 over a newer version. Use the Windows Control Panel to uninstall these components in order : i--- Download Itunes 12.6.5.3 For Windows -64-bit-
Note: You can no longer purchase apps via iTunes for modern iOS versions, but you can still download previously purchased apps to your library. Once installed, you will notice the icon in
(Note: Apple may change or retire this link without notice. If the link fails, use the "Archive.org" method described below.) i--- Download Itunes 12.6.5.3 For Windows -64-bit-
https://secure-appldnld.apple.com/itunes12/091-87819-20180314-AC64344B-2D2D-11E8-B5EE-09E73972392C6/iTunes64Setup.exe