Unfortunately, we don't distribute a portable version of Fiddler 4 in the sense that you can run it without installation. However, there are a couple of options to try and these are below.
If the goal is to just capture traffic, check out FiddlerCap
which will create a capture archive for review.
It is possible to open the Fiddler 4 executable and extract the contents as shown in the Is there a Non-Installable Version of Fiddler
I hope these options help. Please let me know if you have any additional questions.
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