I'm not quite sure what to say... I've never heard of anything like this before.
Installing FlashFXP makes no changes to your system or network configuration, The installer merely copies over the files (all of which are installed into the \FlashFXP folder, creates the start menu shortcuts and assigns flashfxp to open .fqf files.
Have you tried re-downloading FlashFXP from our website?
https://oss.azurewebsites.net/download.php