Hi there's no direct 'downgrade', it's a case of uninstall then re-install. However, please be aware that the v6.6 DB cannot be converted back to a v6.5 DB, you'll need to restore a backup or create a new DB. Note also that processes exported from v6.6 cannot be imported into a v6.5 DB - they are not backward compatible.
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John Carter
Professional Services
Blue Prism
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