Could you please sign the certificate you use to distribute and deploy Fiddler.
I am generally very causes about what I install and like to see best practice efforts to ensure what I install is safe. to support user wanting to be safe and promote expectations of good behaviour from legitimate and honourable software supplies could you please sign the certificate (and ensure it is from a reputable CA).
Fiddler *is* signed by a code-signing certificate. If you're talking about the warning you see on upgrade that the signer is unexpected, please see https://fiddler.ideas.aha.io/ideas/FID-I-369.