I've been using CUTEFTP for years, version 2.8, and it's always seemed robust. I don't appear to have my original setup file (I usually keep them), but the entire folder C:\Program Files\CuteFTP containing 21 files is only 1.3MB, and I've just ZIPed it to 621KB. I expect it would run straight from the executable; this version, 2.8, probably came out only shortly after the invention of electricity and indoor plumbing, much less registries! You're welcome to try it if you don't settle on anything else. Alternatively later versions are at the developer's site: