It takes over 4 GB of space to download a Windows 10 .iso. I have to use
a double layer DVD to burn a bootable installation disk after downloading
an Windows 10 .iso file.
You can have a bootable live installation from a USB flashdrive. The flashdrive would have to be larger than 4 GB.
Insert your SD card you have with an .iso file into the slot in a PC and then
burn the DL DVD.
A smartphone is another internet that you see. Does Microsoft have a download website you can download from? Very cumbersome it sounds using a smartphone when a PC is easier to use.