CS4 on macbook pro retina display

[chiharul4128928]

Hello, i just downloaded CS4 (purchased around 2009) onto macbook pro (2015) with retina display.  maybe because CS4 is old, when i ope PDF using acrobat pro that came with CS4, PDF content looks fuzzy (the same PDF document opened by preview that came with macbook pro shows very sharp font).  Do you know what i can do to fix it?

Also, do you know if i can upgrade CS4 to more current CS5, or CS6?  How much is it to upgrade my CS4?

Thank you

[John T Smith · Accepted solution]

CS4 is old enough that I don't think there is anything you can do to improve the display

CS5 is no longer sold, and CS6 no longer has upgrade pricing

In fact, as far as I know, even CS6 is not going to do well on a modern "high resolution" display

All development effort is now aimed at the Cloud programs, which are only available by subscription