For me I just let it all go to the Downloads folder, then I have other
folders in there and manually move them to where wanted. For instance
I download applications I want to test for ham radio, so I store them
in a folder so named right in Downloads, but I also download some PDF
files of documentation for some of those same apps and keep them in
a separate folder under Documents named PDF and under that folder
subject name. Everyone has there own way of doing things but keeping
all downloads in the same place allows me to know where end up and I
then sort it out.