The LP MB is the L-Phase Multiband, the replacement for the LP64 Multiband. As mentioned above, the L-Phase plug-ins are new plug-ins with separate installers. They are not part of the Engineering FX Suite or any other SONAR installer.

They appear as separate products in your account as well.

Hmmmm. they don't appear in my account.  I wonder why I had access to these in my previous installation?  What date did they become available in the command center?

L-Phase plug-ins were added in the 2016.04 update near the end of March 2016. At that time they were in a new Engineering FX Suite installer.

Ah, gotchya. As my membership lapsed early March, that appears to be the reason why I don't have it.  What I'm stumped with is how I had it in the first place?

My guess...you were able to run the 2016.04 update at the time but had the update removed once the membership expiration was processed. Still might be worth pursuing with account support. They may restore the 2016.04 update. Although you would not have the recent updates to the plug-ins.

This is the error message I'm getting. 

Ah, gotchya: thanks, Scook.  You've been an amazing help.  I've contacted Support: we'll see what happens.  I'll eventually renew my membership, but $499 a pop is pretty pricey as an annual fee.  I'm trying to keep it to a renewal once every 2 years, so eventually I'll catch up on the new updates.  :) 
 

thetruevine
 I'll eventually renew my membership, but $499 a pop is pretty pricey as an annual fee.

I agree that $499US is way too much for renewal. Of course, that is not the current renewal price. To see your current price go to http://www.cakewalk.com/Products/SONAR/Renew and it may be less at your favorite discounter.