I just upgraded to CC from a super old CS6 version of Lightroom. Now when I hold down the option key and drag the exposure slider I no longer see the clipping highlight range. Did this get removed from the new version? All I can do now is click the highlight icon (top right of histogram) but this only shows red when highlights are totally blown out whereas before it would go white, blue red etc.
What version NUMBER of Lightroom do you have now? Please go to Help->System Info and report the version NUMBER of Lightroom you are using.
What is the version NUMBER of your operating system?
The ability to use the clipping display via Option+dragging the Exposure slider should be available to you whether using CC or perpetual licence version
It may be that the preference file from the previous version of Lightroom is corrupt. So, it's worth checking whether resetting preferences helps.
Procedure to reset Lightroom preferences is: hold down Alt and Shift (Windows) / Opt and Shift (Mac) while opening Lightroom then choose Reset Preferences.