You're referring to Adobe Illustrator CS4!

Adobe Illustrator CS4 is a vector graphics editor that was released in 2008 as part of the Adobe Creative Suite 4 (CS4) package、Here are some of its key features:

New Features in AI CS4:

1、Multiple Artboard Support: One of the most significant features introduced in AI CS4 was the ability to create multiple artboards within a single document、This allowed designers to work on multiple designs simultaneously and easily switch between them.
2、Improved User Interface: The CS4 version introduced a more streamlined and customizable interface, making it easier to access frequently used tools and features.
3、Blob Brush Tool: The Blob Brush tool allowed users to create more expressive and natural brush strokes, similar to those found in Adobe Photoshop.
4、Gradient and Mesh Improvements: AI CS4 introduced improved gradient and mesh tools, making it easier to create complex and nuanced color transitions.
5、Live Paint: The Live Paint feature allowed users to easily fill and stroke complex shapes with a more intuitive and interactive method.
6、Improved Performance: AI CS4 was optimized for performance, with faster rendering and more efficient handling of large files.

Other notable features:

1、Vector graphics editing: AI CS4 allowed users to create and edit vector shapes, paths, and objects with precision and accuracy.
2、Layers and layer management: The software featured a robust layer management system, making it easy to organize and manage complex designs.
3、Effects and appearance attributes: AI CS4 included a range of effects and appearance attributes that could be applied to objects, such as drop shadows, glows, and 3D effects.
4、Integration with other CS4 apps: AI CS4 was designed to integrate seamlessly with other CS4 applications, such as Photoshop, InDesign, and Acrobat.

Legacy and Impact:

Adobe Illustrator CS4 was a significant release that built upon the foundation established by previous versions、Its new features and improvements helped to further establish Illustrator as a leading vector graphics editor, and it remains a popular choice among designers and artists to this day.

System Requirements:

To run AI CS4, you'll need:

* Windows: Windows XP (SP2 or later) or Windows Vista (SP1 or later); 1 GHz processor; 512 MB RAM (1 GB recommended); 1 GB free hard disk space.
* Mac: Mac OS X 10.4.11 or 10.5.5; PowerPC G5 or multicore Intel processor; 512 MB RAM (1 GB recommended); 1.3 GB free hard disk space.

Keep in mind that AI CS4 is an older version, and it's no longer supported by Adobe、If you're looking for a more modern version, you may want to consider upgrading to a newer version of Adobe Illustrator, such as Illustrator CC.