Well, first off, the only “six track” mix on there is the 5.1 - the rest are all stereo and mono.
Second, there’s no 1.6 for either DNR or no DNR. There’s a 1.4 no-DNR that has a new color grade courtesy of Sanjuro, and both it and the DNR Blu-Ray ISO have a new scan of the opening crawl.
Third, MySpleen invites are closed and have been for a long time. There’s been rumblings that they’ll open up invites again but nothing official.