Sorry for the late reply. Since version 4.6.20172.31233, Fiddler installation is per-user. If there is any old per-machine installation, it would be removed during the installation because the case of having both installations is not supported. This installation does not install on the per-machine location, because it is per-user installation.
However, please, note that if you are updating from an old per-user installation to the latest version, the initial installation location of the per-user installation will be respected.
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