I heard back from my internal contacts. Going forward, DAS will not be officially supported by Microsoft. This means, it may be possible to install and use like many other open source softwares, but Microsoft does not maintain them or offer support for them.
Existing clusters which were missing built-in Tex and Hive views may still receive support, however it is highly recommended to move to the new version.
Support of DAS will not be provided for HDI version 4.0.2 or later
On another note, I took a look at the scrips line by line as you suggested. I visited the link in my browser. It returned a 403 forbidden. There are two possibilities for this, it requires authentication, or it only accepts connections via apt-get. So then I tried running line-by-line on a linux vm, and got the same 403 response. This means someone on the amazon side put up restrictions, and the script would not work anyway.
I'm sorry I wasn't able to help you better.