If you already have Subversion working copies on your Mac then you need to add them to the source list in Cornerstone.
You can either drag the working copy folder from the Finder to Cornerstone's working copy source list or:
You can also click the Add Working Copy... button in the toolbar:
The Nickname field is disabled when multiple folders are selected and the folders' names will be used as their nicknames.
Cornerstone will automatically detect the version of your working copy and use the correct Subversion version when accessing it.
Note that Cornerstone will select the correct Subversion version to use when accessing your working copy. As a result the working copy will not automatically upgrade your 1.4 working copies to 1.5. Instead, to upgrade an existing 1.4 (or 1.5) working copy to 1.5 (or 1.6) format use the Working Copy > Upgrade Working Copy… function.
If you get an error that your client software (i.e. Cornerstone) is too old then your working copy has not been upgraded completely. This can be solved by:
svn update /path/to/working/copyor:
change-svn-wc-format.py
from the Subversion site and executing the following command in the terminal:change-svn-wc-format /path/to/working/copy 1.5
or
change-svn-wc-format /path/to/working/copy 1.6
depending on the desired target version.