Basilisk or Pale Moon (community editions with Flash support) or Waterfox Classic .
When an application (typically a web-based game, an educational tool, an old presentation, or a corporate training module) shows this message, it is executing a built-in version check. The code inside the .swf (Small Web Format) file asks your browser: "Does the installed Flash Plugin have a version number equal to or greater than 9.0.246?" this application requires flash player v9.0.246 or higher
If you’ve been around the internet long enough—especially during the 2000s and early 2010s—you’ve likely encountered a frustrating, yellow-boxed error message: "This application requires Flash Player v9.0.246 or higher." For many users today, this message is a confusing relic. For others maintaining legacy systems, old games, or internal corporate tools, it’s a daily roadblock. Basilisk or Pale Moon (community editions with Flash
By following the methods in this guide, you can coax that old application back to life—just remember to air-gap the machine or disconnect from the internet before running any legacy Flash content. Safety first, nostalgia second. For others maintaining legacy systems, old games, or
swfmill (to decompile), JPEXS Free Flash Decompiler (open source).