Transfer any file using FTP (more infos) without installation.
Download Portable FlashFXP Beta on RapidShare (3.5 MB)
Download Portable FlashFXP Final on RapidShare (4.2 MB)
Extract on hard disk or USB key and run FlashFXPPortable.
On first run on a new computer enter code from file ffxpkey.dat.
Language fixed by launcher according Windows localisation.
Settings of installed FlashFXP should be preserved.