2 Replies Latest reply on Feb 13, 2018 10:56 AM by Dov Isaacs

    Acrobate 8 Professional Question when opening a PDF

    robertb39512735

      i am using Acrobat * professional, with MAC OS High Sierras. Yes, it does indeed seem to be working. However, I have a large number of PDF Scanned sheets of music. i never had a problem opening them before, with just Acrobat Reader. However, now that I have successfully installed the oder Acrobat *, i am constantly getting a message that the file could not be opened because it is from an unknown source. My solution is to go to the Apple system preferences, security, and choose open anyway. But that is cumbersome and now seems to happen even if i choose to open a PDF using Reader DC, rather than the default, Professional. Simply put, i want to be able to open any number of PDFs without having to go this cumbersome, one by one selection process. Thanks.