I routinely download them to simulate different environments ranging from older 7-mode to earlier ONTAP releases. There are customers that cannot upgrade so I try to position a simulated environment to assist. Most of the files are *as-is* and not supported anyway. Why remove them?
Please, PLEASE put them back! or at the least re-enable the old Simulate ONTAP download page. Right now it redirects to the "current" tools site limiting selections to 9.5 / 9.6 and 9.7