Most software downloading is done over the internet via a router using wifi or ethernet cable, or from a CD or DVD placed in the CD/DVD drive of your computer. As to the USB in your question - I would need more info as to what you are trying to achieve and what operating system you are using. Are you trying to download to an external hard-drive that is attached to your computer by a USB cable?
You can email it to yourself and download it to your PC from your email. You can also plug your phone into your PC via USB and drag and drop the photos.
search in google
No, you just connect your psp to PC via usb. and you copy and paste the music into the music folder on the psp.
You use the Media GO! program on a PC, you buy the games from there and it transfers them to the PSP via USB.
via usb cable
To download songs from a PC to a tablet you would need to connect the tab to the PC via a USB cable and then locate the folder where the songs are saved on the computer. Copy and paste or cut and paste the files into a selected folder on the tablet.
Transfer the files to your phone via a USB cable, infrared or Bluetooth connection. You can use the Mass Storage or Nokia PC Suite.
install driver
Via bluetooth or USB cable.
put it on to a usb drive then download it onto your PC
Yes. You can do this by connecting it via the provide USB-to-Micro-USB Cable.
YES