problem BOOTMGR is missing

Sir/Madam, I download Debian amd64 of 4.4G twice from two DVD images. But it shows me BOOTMGR is missing when I make my pendrive bootable. So please send me a link so that I can download directly from that link. Send me the link which having network packages, so that I

Problem during installation

Sir/Madam, I download Debian amd64 of 4.4G twice from two DVD images. But it shows me BOOTMGR is missing when I make my pendrive bootable. So please send me a link so that I can download directly from that link. Send me the link which having network packages, so that I