Because the installer does not read SONAR preferences, never has. Preferences have nothing to do with ContentDir other than it serves as part of the default paths. Cakewalk installers look at ContentDir and you have specified a product path where there should be a generic Cakewalk Content path. Should you purchase and install Rapture Pro, the content for Rapture Pro, based on your ContentDir will install in "E:\Sonar Platinum\Rapture Pro" an odd location for something which has nothing to do with SONAR Platinum.