Update just like you originally installed. You only need the installers for the updated packages. See http://forum.cakewalk.com/FindPost/3247552 for the list.

Thanks Scook

So far, it's not working.
 
After hours of updates, because this is a BIG one, it won't run. 
 
I've had Sonar before the X versions, owned and ran X1, X2 & X3 PE versions, upgraded to Sonar Platinum, and have not had any problems until today. I feel something got missed before releasing Foxboro. I also upgraded to Z3TA+ 2 today, before the deadline on the upgrade sale.
 
I'm running Windows 7 64-bit, 16Gb, 3 fast HDDs, screaming fast Mushkin USB3 for page file. Sometimes I've started up Sonar without all of the other elements active, and after Sonar does it's start-up scan for components and VSTs I'd get a message saying whatever wasn't accessible. This may be where the current problems lie. 
 
After the update I wanted to import some of the room settings, so I started up Sonar Platinum, the console came up, and it started scanning for VSTs, etc., the the BSOD appeared and my system rebooted. Admittedly, I had a few other apps open, including Excel. However, that never caused problems before. 
 
The system rebooted, and before loading anything else (other than a few common start-up apps), I tried starting Sonar Platinum again. This time, it loaded the console view, started with the VST scans, and the system restarted without the BSOD this time. 
 
I attempted to enter a tech support ticket, because it was just 5 minutes after tech support phone lines closed for the day. However, once I completed everything and went to submit it, I received this response saying the Cakewalk little place on the Internet was down. Big surprise, given the size of the updates. Why not have a dedicated server for tech support? Very, very annoying. It lost everything I'd typed in. tps://scontent-sjc2-1.xx.fbcdn.net/hphotos-xap1/t31.0-8/11216607_10206979116415284_3279898904164965357_o.jpg
I feel Cakewalk botched the Foxboro release, and I can't imagine how many other people are going to have similar problems. Maybe they should have tested this a little more before release, because I can't even use Sonar at all right now.
 
Not good at all. 

I just finished downloading and installing Foxboro. Everything works, did a manual scan of vsts and they all showed up. I opened my current project and everything is cool.
 
Did everyone get the little dialog box about  personalizing?

CCC definitely needs an "update all" button!!

gbowling
CCC definitely needs an "update all" button!!

YES, and CCC definitely needs to NOT do a complete rescan after every component install.

I guess I was stupid to run CCC while Sonar was open. I got a message to the effect of 'Can't install while product is running'. So I closed Sonar. But too late apparently. My Sonar install is still at 21.4 build 30 (Everett), but Foxboro is gone from the CCC version list.
 
What now?

I cannot tell what state your C3 is in from the description provided. You may be able to reinstall or at least rollback and roll forward to Foxboro.

Foxboro includes Strum Session 2? And I just a few weeks ago paid for that upgrade. That leaves a bad taste in my mouth. I hope there are differences between the version I paid for and the one included in Foxboro.

Strum Session 2 is not the same as Strum GS-2. You purchased the professional series product, not a Session series. I just checked the AAS site, there is no Strum Session 2 for sale yet.