Just wanted to let everyone know the ID archive is up! You can visit the link at the bottom of any NG+ page in the "Affiliates" section of the footer. Or you could just use/bookmark this link: http://ngplus.net/InsaneDifficultyArchive
All downloads there are also intact.
NOTE: This is a static copy of the website. You will ONLY be able to navigate the site and download the mods. Searching, logging in, etc. will not work. This is essentially the same thing as looking at a web archive.