Midiboy
I can confirm that as well.  The additional content is the Artist stuff.  If you have either Artist or Plat, you do NOT need to download that. Save yourself a 1GB dl. 

What if I own Platinum but don't have it installed?
 
I'm planning on reinstalling Windows soon and want to know if I can use only Bandlab Assistant going forward, or if I will have to install Platinum legacy first in order to get all my plugins/instruments

Certain plugs that came with Plat are NOT included.  You have to have them installed.  (Melodyne, AD2, etc.).

*** EDIT ***
I get what's streamlined, no 3rd party plugs which is understandable.
 
Why is it "Streamlined"?
 
I like my Sonar just fine. Don't streamline me.
......waiting.

Anyone tried out the new setting for the piano roll?

Well this is nostalgic, experiencing dial up speeds on the download, 25 minutes and 63% done,thanks for the trip down memory lane 

I guess I'll install Bandlab Assistant in a SONARless VM later and answer my own question :-/

Downloaded and installed - all working fine. Just one thing (as mentioned by others) I was a lifetime purchaser and now Cakewalk by Bandlab is only valid until 04-10-2018. Restarted Windows to see if that made a difference - it didn't. The question now is - will we have to connect once a week to keep the installation valid? I wouldn't be too happy about that as I try to keep my DAW machine off the internet as much as possible.

bitman
Why is it "Streamlined"?
 

they got rid of/didn't re-license all the 3rd party stuff?

I have Sonar Professional, wll it be a version of that one as well?

andyjobson85
I guess I'll install Bandlab Assistant in a SONARless VM later and answer my own question :-/

it would be informative to know what's being done, vm snapshot before and after?