Thank you for your response. I am struggling with it. I have uninstalled the previous versions and reboot my mac but I am getting the following message:
"The operation can't be completed because some items had to be skipped. For each items choose File > Get Info, make sure Locked is deselected and then check the Sharing & Permissions..." etc... I am in Mac , so there is no apparent Sharing & Permissions -- Quite confusing. In any case it would not open. If you can guide me through it would be appreciated
Best
Jean