Q: Each time I download a new version of Adobe on my iMac I receive a line across the monitor. How do I delete these 4 lines?

Howdy Steve,

If you are having an issue with lines appearing on the display of your iMac, I would suggest that you troubleshoot using the steps in this article - 

Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support

Thanks for using Apple Support Communities.

Best,

Brett L