The 'c' option was deprecated in 1.6, and disabled in 1.8. You should backup and then drop the database before running install to reset your data.
...if you use -c on the install command-line.
[1.8 190e9ee] -c has been disabled for a while, finally making it explicit, [master 5e68c42] -c has been disabled for a while, finally making it explicit,
Seth Leger (community account) October 14, 2010 at 4:16 PM
Returns the -h screen and:
An error occurred: Nothing to do. Use -h for help.