Dear Cakewalk

There have been many posts about the new X1 and I have seen solid responses from Cakewalk here in the forums for a lot of the questions except for these two. Please give us some answers asap! Thank you.
 
1. What is the "05_SONAR_X1_Producer_Additional_Content" installation.
 
2. Why can't many of us install it without the Dimension Pro error?
 
Help us resolve this with a piece of Cake Wisdom...thanks!