While you may see searches for a "free download" of the full professional Version 7, this was originally a .
If you are looking for psychrometric tools without the risks of unofficial downloads, consider these official resources: Ashrae Psychrometric Analysis Cd Version 7 Free Download
Available for iOS devices (iPad/iPhone) via the App Store ; while it may have a small fee, it is significantly cheaper than the full desktop software. While you may see searches for a "free