Here is a simple download manager using C Runtime functions. It's not very good, but it's OK to use. Neither the URL nor the filename may contain spaces now, this will be corrected in a future version.
FAQ:
Q: How to build?
A:
nasm -fwin64 downmgr.asm
(download this file from the attachment)
GoLink /console downmgr.obj msvcrt.dll urlmon.dll
Q: What about an improved version?
A: It comes when I had enough time
Q: Will you implement a GUI?
A: No, I won't. If you want one, use a browser
Q: How to use it?
A: e.g.
downmgr.exe
http://godevtool.com/Gorc.zip
GoRC.zip