Here's another bit of info I discovered along the way. All the download links on the Digidesign DAE DSI download page are broken.
http://archive.digidesign.com/download/daedsi/
But it's easy to fix the broken links. Just remove the "ak" in the "akdownload" and the link works.
So if you were to click on the link for DSI 5.1.1, you get this error:
Not Found
The requested URL /60193/support/digi/mac/dae-dsi/dsi511.hqx was not found on this server.
Look at the URL in the address bar. It says:
http://akdownload.digidesign.com/sup...dsi/dsi511.hqx
Remove the ak before download and press return and the link works:
http://download.digidesign.com/suppo...dsi/dsi511.hqx
This works for almost all the other download links on the page.
Here's the working download link for DSI 3.4.2:
http://download.digidesign.com/suppo...i/dsi3.4.2.hqx