How to stop "Pantone Colors May No Longer Be Available...." popup

As a last (first?) resort, the following script can be used to open a file while ignoring dialogs:

var savedDisplayDialogs = app.displayDialogs;
app.displayDialogs = DialogModes.NO;
var fileOrFiles = File.openDialog("Select the file/s to open (ignoring warnings):", Multiselect = true);
for (var i = 0; i < fileOrFiles.length; i++) {
    var openFiles = app.open(File(fileOrFiles[i]));
}
app.displayDialogs = savedDisplayDialogs;

Once installed, the script could have a custom keyboard shortcut applied via Edit > Keyboard Shortcuts. You could replace the standard CMD/CTRL + O shortcut by assigning it to the installed script.

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html