I am wondering if an existing .CTB file can be added to AutoCAD 2015 for MAC during the trial period?  The company I work for has not purchased the license for my seat yet but I would like to plot some of my work while using the trial period.  It seems when I go to the location of the .CTB files I can only get to a certain point to the other .CTB file locations and then certain files are not accessible.  

Thank you for any help in advance!