Version 1.6 was designed for older macOS environments and may not run stably on modern Apple Silicon (M1/M2/M3) chips or latest macOS versions like Sonoma.
Celsys provides a generous free trial of the latest version (v3.0), which includes all the features of 1.6 and more. Smith Micro Clip Studio Paint EX 1.6 for Mac Free Download
The EX version famously unlocked unlimited animation frames, allowing professional-grade 2D animation directly within the app. Version 1