iTunesAir 1.4 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer file is commonly found as iTunesAir.exe. This software was originally designed by CandySoft.com, Inc. The software lies within Internet & Network Tools, more precisely Network Tools. The most popular versions among the program users are 1.4, 1.3 and 1.1. We recommend checking the downloaded files with any free antivirus.
From the developer:
iTunesAir enables you to share your iTunes libraries among your computers over the internet. It helps you to easily stream or transfer music, movies, TV Shows, apps and more among computers that accesses internet.
Apple iTunes has the function "Home Sharing", but with that you can only copy among five computers in your household. You have to login with the same Apple ID and work in the home intranet.
You may want to check out more software, such as PageScope Network Setup, Veeam FastSCP or CrossFTP Server, which might be similar to iTunesAir.