点击“use legacy licenseing”
点击“ADD A license”
出现如下图，请选择“Add Eval SDL (RegCode)”
弹出注册界面，输入license code，邮箱任意输入
至此，软件“Understand”破解成功！
license code：
185F996AEEC2 7808F4308398 F38075B00218 EBF578C60F6E 00479F7EE8D6
参考：
https://www.zhinin.com/understand-mac.html
https://www.zhinin.com/understand-mac.html
http://www.pc6.com/mac/561878.html‘
http://osx.cx/understand-for-mac.html
https://www.newasp.net/soft/472127.html
https://www.zhinin.com/class/apple/mac-soft/osx-yingyonggj/osx-development/page/2