Please contact our Sales address for refund requests.
If you'd like help with the problems you raised in the other thread, please answer the questions Enternal posted there a few days ago, and also give details of which file types you are having trouble loading, and where they are being loaded. (e.g. Is it in the Opus preview panel, or is everything about the File Open viewer which is outside of Opus? But please answer in that thread rather than here.)