This specific version was released by Adobe in early 2021. It was a significant stability update following the initial v25.0 release, addressing critical bugs in areas like cloud documents, rendering, and third-party plugin compatibility. It runs natively on both Intel-based Macs and Apple Silicon (M1) Macs, though initial M1 support was introduced in this era.
: This version solidified the workflow between the desktop app and the then-new Illustrator for iPad, allowing for seamless cloud syncing of creative assets. Adobe Illustrator 2021 v25.1 -TNT-.dmg