Hi, I recently used Fiddler installer "[Sep-15-17] v4.6.20173.38786" to upgrade from a July 2017 build. The installer, even when run as administrator, no longer chooses Program Files even if Fiddler is already installed in that location. Instead the location is always "C:\Users\USERNAME\AppData\Local\Programs\Fiddler" whether I run it as admin or not.
So I manually changed the location to "c:\Program Files (x86)\Fiddler2". But then the installer told me uninstall failed and to manually uninstall the july version. In the programs menu I had trouble finding "Fiddler" because you actually put the company name in the program name field instead of just in the company field. For example it's listed as "Progress Telerik Fiddler" which I don't think anyone is going to think of if they want to uninstall. Almost all programs put their company name in the company field and leave it out of the program name. Anyway, I did uninstall it but chose to keep settings.
Then when I installed it I noticed it connecting to emergency update even though I had that disabled in the registry. In other words the uninstall though promising to keep my settings wiped out the:
so I had to re-add that.
Now everything appears to be working ok.
I think you should fix the following things in the installer: