安装allegro的时候那么多产品选择？

还有好多产品名字一样就是有一个数字的区别，难道是老版本和旧版本?
不过如果是旧版本的话应该不用显示出来啊，直接全部装新版本不就可以啦。
哪位明白的大哥讲讲。

在帮助里面找到了这些话：

The new Allegro offerings comprise three levels: L, XL, and GXL.

• L--The Allegro L product series provides PCB design products aimed at solving mainstream design challenges.

• XL--The Allegro XL product series provides advanced PCB design products that address more complex and high-end design challenges through integrated constraint-driven automation and distributed team-based design productivity.

• GXL--The Allegro GXL product series provides differentiated PCB design products targeting leading edge design challenges such as advanced package co-design and multi-GHz signal integrity (SI) analysis.

• 不过还是有好多不明白
  

做库的话L就够了，画版起码要XL，GXL功能更全，不过license比较贵的说