Adobe Flash Player is the high performance, lightweight, highly expressive client runtime that delivers powerful and consistent user experiences across major operating systems, browsers, mobile phones and devices.

Installed on over 750 million Internet-connected desktops and mobile devices, Flash Player enables organizations and individuals to build and deliver great digital experiences to their end users.

* Immersive experiences with Flash video, content and applications with full-screen mode.
* Low-bandwidth, high-quality video with advanced compression technology.
* High-fidelity text using the advanced text rendering engine.
* Real-time dynamic effects with filters for Blur, DropShadow, Glow, Bevel, Gradient Glow, Gradient Bevel, Displacement Map, Convolution, and Color Matrix.
* Innovative media compositions with 8-bit video alpha channels.
* Blend modes, radial gradient, and stroke enhancements.
* Additional image formats: GIF, Progressive JPEG, and PNG.

This download is the standalone ActiveX installer for Internet Explorer.

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Websites still use Flash Player 10 however its recommended to upgrade, but in your case I would just leave it at your current version.Flash CS5 launched around this time last year. But the player normally has its own schedule so I'd expect it between now and the fall.