For users seeking modern alternatives, consider Adobe Animate (the successor to Flash), which offers updated features, HTML5 support, and integration with the Adobe Creative Cloud ecosystem. Other tools like OpenToonz, Blender, and Toon Boom Harmony offer robust animation features as well.
Before we hunt for a download link, let's appreciate the target. Macromedia Flash 8 (released in 2005) was the last version released under the Macromedia brand before Adobe acquired the company in 2005. It introduced: macromedia flash 8 portable link
Introduced the On2 VP6 video codec and alpha-channel (transparency) support for video. For users seeking modern alternatives