If what you say is true a more productive approach is to make a derivative of the last known non-malware release of FileZilla with a new name. FileZilla's code respects your software freedom (FileZilla is licensed under the GNU GPL v2, last I knew), so there's no reason not to use that freedom to make a derivative which doesn't come with a tricky installer. Rejecting free software when improvements can be had is an overreaction that could lead to a reduction in software freedom which would obviously be bad. Free software is the path to being able to trust the software you run.