After trying to save the data files for logos to an external drive using the terminal command
ln -s /Volumes/MACAIR1/Logos4~/Library/Application\ Support/Logos4
and finding this didn't work I find I can no longer get logos to work at all even with all the data files on the main drive.
6087.LogosLogs.RichardD.20160506-191903.zip[
6813.LogosLogs.RichardD.20160506-191727.zip
Richard D