Select the latest version from the product list, right click for the context menu. Go down to Roll Back >. From the options at the bottom choose early release for version 5. This is effectively a beta still this is why it's not the latest stated version.
 
Repeat the procedure for engineer FX download. Restart Sonar and rescan your plug-ins if you have to. When you look at the VST3 effects folder you should have the new additions.
 
Or have a read of this.
forum.cakewalk.com/The-Early-Access-Program-is-Now-Live-for-the-Upcoming-Release-of-SONAR-201705-m3610677.aspx

The 2017.05 Early Access period is over. All updates are now in production. The latest version of the installers should be used.

exactly as I thought which are the ones I have d/l and installed. (release June 1 2017) however this adaptive limiter is nowhere to be seen.

interpolated
....................When you look at the VST3 effects folder you should have the new additions.
 

 
VST3 Effects folder? Where is that? I simply right click on the efx box of a track. I can see no VST3 effects folder or effects?

Assuming the engineering FX suite 1.0.4.27 is installed, the scanner ran to completion and a default layout is used, the plug-in should show up. The default physical location for the plug-ins is C:\Program Files\Common Files\VST3\Adaptive Limiter
 
If the plug-in failed to scan it may be in the VST3 FX excluded list in the plug-in manager.

Yeah I know where on the PC they are installed to, and I ran the new scan to completion and teh adaptive limiter is where it should be, however I can not find it in Sonar!! Oh and Plugin manager shows it too...How do I access it within a project?

Interesting, after this last Splat update I also can not see the CA-2A VST 3 either?? I was using it yesterday just prior to the update.
 
Nor Melodyne, Amplitube 4, LPEQ LPMB and TH3...none of these are now available in the pop out efx menus. They were all there prior to latest update.
 
Why does Sonar do all this s#$t just for a program update!!!

ok solved in a fashion...I had to go and create a specific folder, and manually add all of these to it, then add that folder to the pop-out box. So long story short, I can now see it and use it.