This may be a stupid Q, but I'm on my Cakewalk account page, I see the products I just bought (Sonar Platinum), if I download the top "Sonar Platinum" product does it include all of those 17 other available download links   or do I have to download each of those separately too? These include the following and more. Thanks for responding, if you do. 
Classic Creative FX Suite
Engineering FX Suite
Studio Instruments Suite
Artist Instrument Collection
Platinum Instrument Collection
Studio Mixing FX Suite
Cakewalk Loopmasters Content Collection
Cakewalk Sample Magic Content Collection

and more                     ?

I think the bullet points turn green if you have them installed. If they are not ( ie. yellow or red) then click and install them too.Admittedly, I don't pay too much attention to this, as I have been a user since they started using command center, and I usually don't have more than a couple of them with each update.. If in doubt, click on all you want installed.Start with one and see if I'm right. Don't worry ,though. If you find you don't have what you thought you should, you can always go back and grab them.

Oh... thanks for answering. You are referring to using Command Center, which I wasn't using. I will and see what it does. I never used it before. 
Now... I am installing this Platinum on the same computer with Sonar X2 Producer and X3 Producer. I'm not uninstalling either ... yet. Just in case the Platinum drives me crazy and because you really don't have to. 

I also have used Sonar since version 1 and even ProAudio 9 before that. Unbelievably I still had to jump through hoops trying to export an MP3 of my work from Sonar X3, as it was telling me I have to buy an MP3 encoder! I have gotten around that, and it's one reason I will wait til tomorrow to install this beast. I'm in the middle of doing a couple of projects and don't want to run into any problems. Thanks again.

No stupid questions, just stupid answers. I hope this one helps.
You can download each file and install them one by one. The Command Centre will do the same thing, just allows you to do the same from one location, and give you the option of "install all".

I would leave X2 & X3 installed anyway, for a couple of reasons

Yes, leave X2 & X3 installed.  Platinum works side by side with them.  That is what I have on my machine works fine...
 

Thanks for your answers... this forum actually works, that's cool.

I am now really trying to figure out which of the bullet points, under Platinum, I actually need, that are NEW to Platinum that I don't already have installed from X3.

I also would like to know if there is anything new updated in Melodyne, D-Pro or Rapture.

The  Rapture Session is new.. I presume.. 


I have the recommended 3 drive setup on my computer. The Solid State System drive and separate drives for Audio work and Samples. I want to make sure I install things where they belong and keep the 160 GB SS drive (100 GB Free) as free as possible. So I don't want to download and install anything that is redundant. If anyone can help me out with their experience I'd be grateful. Thanks Again.

I am now really trying to figure out which of the bullet points, under Platinum, I actually need, that are NEW to Platinum that I don't already have installed from X3.

 
I would imagine most, if not all of it needs to be installed. There have been successive updates to different suites of plugins so these definitely need updating.
 
The only things I haven't updated are the Dim Pro & Z3TA+2 updates

Skip Melodyne, updates come directly from Celemony.
The only updates to DPro and Rapture are the installers which changed to run in the Command Center.