Where can I find Dell true color?

I've just bought an inspiron 15 7559, everything are good, but the screen color is too bad. My friend said I need Dell true color app to make the screen's color better. But after 4 hours google, what I got were some dead link from dell driver page.

Then I tried findind Dell true color app of some model which were in old topics about true color in 2015. I still cannot find Dell true color app of these model on new driver page.

What happen to dell true color app? The newest topic about this app was about 7-8 months ago! I can not find anything about it at the moment. :emotion-8: