Can even do 60Hz vs the reduced amount that was required to get SwitchResX working on High Sierra. Then I tried switching from HDMI to Display Port and now everything works fine on my old MBP without SwitchResX.
#Switchresx starlogic monitor drivers#
I reached out to the developer and he helped me troubleshoot but was ultimately told that the video drivers in Catalina had a restriction that was not in the previous OS and there was nothing that could be done, my machine just could no longer support 2560 x 1080. I tried all of the solutions above: uninstall and reinstall as a new user, update using EDID, renaming the relocated items file, etc. When I upgraded to Catalina SwitchResX no longer worked and I received the "Not activated - invalid?" message. I was using SwitchResX to display 2560 x 1080 on High Sierra without issue. Thought I should share in case anyone has the same issue I did.