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Please download it from http://www.mono-project.com/download/#download-mac and install it. If you already have it installed, ensure you’re running the latest version.
Please open Terminal and type in:
(The Mono framework has its own trusted root certificates store. Currently (at mono version 4.2.4) this store remains empty after installing Mono on OS X. Fiddler uses the certificates in this store to validate the certificates of the websites visited. So you need to populate this store with a set of commonly trusted root authorities to avoid getting constant certificate warnings from Fiddler. The mozroots tool imports trusted authorities from the Mozilla LXR. )
fiddler-mac.zipto a folder you have write access to.
It is recommended that the full path to Fiddler install folder does not contain any Windows path illegal characters. (At present it is possible that some Fiddler functionality, e.g. various file exports or Fiddler Script won’t handle such paths.)
mono Fiddler.exein Terminal.