The Fiddler 4 installer thinks there's something still installed in c:\Program Files (x86)\Fiddler2, but that folder no longer exists and the old version of Fiddler is no longer listed in "Programs and Features".

Error message when I run the new version:

"Machine-wide Progress Telerik Fiddler installation has been found at C:\Program Files (x86)\Fiddler2\ . Please, use that one or uninstall it before starting the per user Fiddler installation."

The offending folder does not now exist. "c:\Program Files (x86)\Entity Framework Tools" exists. "c:\Program Files (x86)\Google" exists. There is nothing between them. They are adjacent in the directory listing.

Resolution:

1. I uninstalled Fiddler 4.
2. I installed Fiddler2 (installer file version 2.5.1.6) from an old installer that, by luck, I happen not to have deleted.
3. I uninstalled Filddler2 manually.
4. I installed Fiddler 4 again.

Now Filddler 4 runs.

But if I hadn't still had the old installer lingering in my downloads folder, I would have been out of luck. Please fix.