The first step is to get the correct static builds for your operating system. Do not download the source code; you need the pre-compiled executable files. FFMPEG - OpenToonz Add-On for Rendering MP4 Videos
To get the most out of OpenToonz, you need to download and configure . While OpenToonz is a powerful 2D animation suite, it doesn't include the ability to export common formats like MP4 , WebM , or GIF by default. Integrating FFmpeg acts as an "add-on" that unlocks these essential rendering options. Step 1: Download FFmpeg download ffmpeg for opentoonz