ACD Systems does not officially sell Version 14 anymore. However, authorized resellers like Amazon or eBay might have unsold retail boxes (physical discs) for ACDSee Pro 2 or 14.
: You can also check authorized resellers like B&H Photo Video or Insight for older stock or current bundles. Acdsee 14 License Key
If you already own a license but have lost the key, you can find it using these official methods: ACD Systems does not officially sell Version 14 anymore