Yasla Lab and Yasla Pro require macOS 10.14.6 or newer and a Mac with an Apple Silicon or an Intel CPU. CPU and GPU requirements depend on the number of tracks and the kind of media material used.
Release notes are available from within the application, see Release Notes in the Help menu.
If you are using macOS 10.10 Yosemite to macOS 10.13 High Sierra, Yasla 2.12.1 is still available for download (ZIP, 18MB):
After downloading, unpack the ZIP file, drag the resulting application file to the ‘Applications’ folder, and launch Yasla from there.
Yasla contains command line utilities from the FFmpeg project (Source code and building instructions).