POP up to save file at Downloads

HI 

I am facing issue with POP up.

I recorded a script that generates a csv file, all what i need is to save this file at Downloads.

In order to fix the POP up window issue, i configured Firefox to save csv. file always.

When i click Develop script and i ran it everything is OK, but when i run it regularly it is not saving automatically and this leads me to a problem when uploading the script to the BPM.

Please help.

Thanks

Jumana