There is nothing to untick or tick in the SONAR installation regarding either DimPro or "Loops and One Shots", they are completely separate installers. There are 5 separate installers used for a complete X2 Producer installation.
01_Read_This_First.exe
02_SONAR_X2_Producer.part1.exe
03_Loops_And_One_Shots.part1.exe
04_Dimension_Pro_1_5_Setup.exe
05_SONAR_X2_Producer_Additional_Content.exe
The pick list show in

is from the 02_SONAR_X2_Producer.part1.exe installer advanced install option and has nothing to do with the other installers. Nothing from the other installers will be shown in this pick list.