FileZilla_setup.exe /S is the silent installation switch for FileZilla (and it costs nothing ;-)
For uninstall I used
"%ProgramFilesDirx86%\FileZilla FTP Client\uninstall.exe" /S
In my case I did need to remove the PeaZip Folder manually.
rmdir /Q "%ProgramFilesDirx86%\FileZilla FTP Client"
I hope this helps peaople keeping their PC clean
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