Most of the workstations I support are on older versions of W10 and all using Sandboxie V30 and none have issues downloading from Firefox and Iron (Chrome)
I've recently updated 3 stations to 1903 and NONE can download from those browsers, even though their settings are identical to all others. (i.e. full access granted to the downloads folder)
Any attempt to download from within one of the browsers running in SB produces the message "insufficient permissions".
It's obviously a conflict between the new version of Windoze and SB as, if I run the browsers outside SB, downloads proceed normally.
So it's not your fault, but, nevertheless, whoever's running the code now you've gone FOSS, is going to have to fix it because there's no way Microsoft will!
