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Help with install of debian stretch




I'm a newbie at Debian Linux and trying my best but when I'm installing Debian-9.1.0-i386-netinst, I get to a screen that's asking me to insert the disc labeled: 'Debian GNU/Linux 9.1.0 _Stretch_ -official i386 NETINST 20170722-12:43" in the '/media/cdrom/" and press [Enter]
 
I've looked everywhere and I can't find this iso to download and burn to a disc.
 
Please point me in the right direction.
 
Thanks
Bill Pagano