Adobe Illustrator read-only error

Hi,

I have an issue that I am unable to solve, even I went through some solutions suggested around the web and here. 

My issue is: I open Ai and it says it requires authorized "read and write". It cant be opened because it is settled as "read-only" in Preferences folder.  

I am a Mac user and I followed the instructions in this thread, but I can't find an Adobe Illustration file in my Library/Application Support/Adobe folder, though I could find an Ai folder in Library/Preferences called Adobe Illustrator 26 Settings, and one in Library/Preferences/Adobe called Adobe Illustrator. I have turned both folders in "read and write" mode beside my user name. This path hasn't solved the issue. Maybe because I don't have a file in the Application Support folder?

I also uninstalled and installed Ai several times, hoping in a magic change. The Ai doesn't open and keeps saying the "read-only" error.