There is a common error that one might receive when using Adobe Acrobat Pro or PDF Converter Professional. When either saving or adding password protection onto a document.
The document could not be saved. The file may be read-only or another user many have it open. Please save to a different file name.”
The error occurs because of a conflict with the application and the Windows preview pane. Follow the steps below to fix.
Windows 8 Instructions
Windows 7 Instructions
Go to “Computer” or a windows explorer window, click on the “Preview pane” icon in the top right and make sure it is selected on hidden. Then try saving your PDF document again.