Uploaded Indesign CS6 to a new Mac OS and the screen quality is very poor. How can I improve this?

[Charlotte5CDF]

I've recently bought a new desktop iMac and I'm transfering my old software. I don't want to re-purchase inDesign so I've uploaded my old version Indesign CS6 (it does everything I want it to) and the image quality is worse than it was on my old screen. Is there a way to improve this without buying the software again? 

[Derek Cross · Accepted solution]

No. You now have a high resolution screen – your old software needs to be upgraded to match your new system.

[Charlotte5CDF]

Thanks for your advice, thats a shame. It feels worse than it used to on a worse screen which is strange. I've just increased the screen performance in settings and it is better but still pixelated 

[BobLevine]

I'm amazed it even works on a new Mac.

[Derek Cross]

If your work is mission critical, you should upgrade to InDesign 2019/2020 (or the Creative Cloud Suite).