(I have used it myself, and it is completely free. This information includes the following attachments:
flashfxp5_gr\language\ChineseSimplified.dlf
flashfxp5_gr\FlashFXP.exe
flashfxp5_gr\FlashFXP.ini
flashfxp5_gr\FlashFXP.key
flashfxp5_gr\flashfxp.portable
flashfxp5_gr\libcrypto-1_1.dll
flashfxp5_gr\libeay32.dll
flashfxp5_gr\libssl-1_1.dll
flashfxp5_gr\msvcr110.dll
flashfxp5_gr\ssleay32.dll)