After running the latest installer it reports this error.
Running Fiddler did not succeed.
The system cannot find the file specified
And there are no files installed anywhere that I can find. I've been using Fiddler for years. This is the first time I've run into an error where I can't update the product.
Regarding the original post: If you search your disk for Fiddler.exe, are you able to find it?
Regarding the comment: Fiddler was recently changed to support per-user installs. Instead of making this optional, this was made the default behavior.
Adding a comment to this. Why is the installer putting the files in the users AppData folder, it's an app and should be placed in program files (x86) on Windows.