This worked in previous versions where the activation was separate from the Install, but now it is together with the installer, so if the above app is still there, run it, but that might be an older version.
To register now you'll have to remove the license file and re-run the setup. The license file is in ~/Library/MonoTouch and will have the name "License" or "License.v2" depending on the version of MonoTouch you have installed.
The current (2012) error is "mtouch exited with code 99".
In addition to deleting the license file in ~/Library/MonoTouch, as noted by @Kenny, you may also need to delete the contents of /Developer/MonoTouch. If you don't do this, the MonoTouch installer may not do anything at all.
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这在以前的版本中有效，其中激活与安装是分开的，但现在它与安装程序一起，所以如果上述应用程序仍然存在，请运行它，但这可能是旧版本。
要立即注册，您必须删除许可证文件并重新运行安装程序。许可证文件位于 ~/Library/MonoTouch 中，名称为“License”或“License.v2”，具体取决于您安装的 MonoTouch 版本。
This worked in previous versions where the activation was separate from the Install, but now it is together with the installer, so if the above app is still there, run it, but that might be an older version.
To register now you'll have to remove the license file and re-run the setup. The license file is in ~/Library/MonoTouch and will have the name "License" or "License.v2" depending on the version of MonoTouch you have installed.
当前（2012 年）错误是“mtouch 退出，代码为 99”。
除了删除 ~/Library/MonoTouch 中的许可证文件（如 @Kenny 所说）外，您可能还需要删除 /Developer/MonoTouch 中的内容。如果您不这样做，MonoTouch 安装程序可能根本不会执行任何操作。
The current (2012) error is "mtouch exited with code 99".
In addition to deleting the license file in ~/Library/MonoTouch, as noted by @Kenny, you may also need to delete the contents of /Developer/MonoTouch. If you don't do this, the MonoTouch installer may not do anything at all.
如果有人遇到此问题：
对于那些不知道 Mac 上“~”来自哪里的人：Alt + N + Space！
In case someone has trouble with this:
For those of you who don't know where "~" comes from on Mac: Alt + N + Space!
有关当前解决方案，请参阅此答案：
如何重新激活 Monotouch？
这个原始答案已过时
see this answer for a current solution:
How do I reactivate Monotouch?
this original answer is obsolete