Самый простой вариант, вероятно, с клиентом командной строки (или TortoiseSvn с аналогичными параметрами).Вы хотите сделать заказ с флагом силы на:
svn co --force <URL> <WC>
Из справки:
If --force is used, unversioned obstructing paths in the working
copy destination do not automatically cause the check out to fail.
If the obstructing path is the same type (file or directory) as the
corresponding path in the repository it becomes versioned but its
contents are left 'as-is' in the working copy. This means that an
obstructing directory's unversioned children may also obstruct and
become versioned. For files, any content differences between the
obstruction and the repository are treated like a local modification
to the working copy. All properties from the repository are applied
to the obstructing path.