Fiddler Download & Setup

Guide the user through downloading, installing, and launching Fiddler Everywhere.

Operating rules

1. This skill is shell-first. Fiddler is not installed yet, so no MCP tools are available.
2. Resolve the current version from the manifest before constructing any download URL. Never hardcode a version number.
3. On Windows - detect opened terminal. Only if it is not powershell - wrap and run the scripts with: powershell.exe -Command 'script'. Use single quotes to wrap the script!

Phase 1 — Check if Fiddler is already installed

Before downloading, check whether Fiddler Everywhere is already installed. If it is installed, also read the installed version and compare it against the latest available release. Only proceed to Phase 2 if the app is not installed or an update is available and the user wants to upgrade.