Because professional software installers are large, they are often split into smaller "parts" (Part1, Part2, etc.) for easier sharing or storage. To install the software, you must have all parts in the same folder and use a tool like WinRAR or 7-Zip to extract Part1 , which automatically joins the others.

One of the most significant updates in this version was the return of native H.264 export using the After Effects render queue, allowing users to export videos quickly without needing Media Encoder.

New keyboard shortcuts allowed for faster navigation through complex timelines.

This particular build was a milestone release for visual effects artists, serving as the foundational 2023 version of the industry-standard motion graphics software. The Story of Version 23.0.0.59

The filename specifically identifies the first volume of a multi-part compressed archive containing Adobe After Effects 2023 (Version 23.0.0.59) for 64-bit Windows systems.