configure flashgot portable

[Argondos]

Hi, I'm actually using firefox portable and Free Download Manager portable version. I installed Flashgot, but, as I'm using a portable fdm version, it cannot detect fdm's presence (it leaves no tracks in registries). I tried to set fdm portable as a custom download helper in flashgot settings, but it didn't work (I didn't add any other settings than [URL]). Is there some way to make flashgot recognise fdm portable presence ??

Thanks in advance for your answers

PS : To make FDM portable, install it and click file->create portable version