I'm concerned about blowing up my fresh install of X3 by going back to X2 and just installing Z3ta+2! Is there anyone that has had success doing this without having to uninstall X3 and installing the older versions of the X series. I just ran the gauntlet getting just X3c installed on a new laptop. I really don't want to run the risk of having major problems just to get +2 in there. Perhaps Cake could make it available as a separate download for its own installation for those of us who would like it in X3! Help, anyone? 

Z3ta is a separate download. At least separate on my account in the store.
You can just download it and install.

Z3TA+2 is not part of X2 or any other version of SONAR. It is a separate product with it's own installer. It was bundled with X1 Producer Expanded and PC4K Expander Gate, called the X1 Production Suite. Even then it had a separate installer on the Production Suite download page. The original Z3TA+ v1.5, now called Z3TA+classic is bundled X series SONAR.

In my account it shows +2 and the serial and registration numbers but no download! 

Mine too. In my case, the Z3TA+2 installer is located on the page linked to by the "First-Class upgrade to Production Suite" line item. There should be a line item in your account with a download link that has the same date as the Z3TA+2 serial number line item. That link should take you to a page having multiple installers on it. One of those installers will be for Z3TA+2.

I'm not seeing the "First-Class upgrade to Production Suite" item. Where is that exactly located?

You may not have that item, that is how I got Z3TA+2. Look for a line item in your store account that has a download link with same date as your Z3TA+2 serial number. It may be the link to a page of installers including the one for Z3TA+2.

Thanks, but I found the installers. I just launched a search for the Z3ta+2 installers and it took me right to the product page. Thanks for the help just the same.

never mind

The installation went well. Just had to get new registration numbers and I am up and running. Thanks again for your time and effort. I hope I can return the favor some day.