Wallpaper Engine is a premium, paid application available exclusively on and the Humble Store for Windows [2]. It costs around $3.99 USD (prices vary by region) [2].
The developers do not offer a free trial or a free tier for PC [2]. Wallpaper Engine Free Download (v1.4.180)
Wallpaper Engine does not have a free version, and third-party sites offering free downloads of version 1.4.180 are distributing pirated software [1, 2]. Wallpaper Engine is a premium, paid application available