This forum is dedicated to basic help and support :
Ask here your questions about basic installation and usage of Mageia. For example you may post here all your questions about getting Mageia isos and installing it, configuring your printer, using your word processor etc.
Try to ask your questions in the right sub-forum with as much details as you can gather. the more precise the question will be, the more likely you are to get a useful answer
Seems the filenames for the netinstall images are different, or something got borked when they were updated. In the meantime, you should be able to remove the .1 from the download link. So Mageia-7.1-netinstall-i586.iso becomes Mageia-7-netinstall-i586.iso. As it only downloads the most recent packages, it doesn't really matter if you use 7.1 or 7 netinstall image, unless the original 7 netinstaller doesn't boot on your hardware.