Finally took the plunge to upgrade. Didn't realise that data cld be migrated. Opened 5, linked to dropbox, it identified an old sync and asked whether I wanted to migrate. Before I did that, I went back to the old msecure and did a sync to make sure everything was up to date (my bad).  Now cant seem to work out how to import the data again?? Have tried everything - deleted the new app several times. Nothing seems to work.

Will stick to msecure 4 for the time being.

deleted the file under apps and this enabled me to start all over again