If you cannot play the audio files, there are a few things you can try:

1. Make sure you have installed all the latest updates for your operating system and browser.
2. If you are using Internet Explorer or Edge, try switching to Firefox or Chrome.
3. If you are using Windows, right-click on the link for an audio file, then click on 'save target as' (or 'save link as') to save the file to your computer. Try to play the file from there.
4. You can also access all of the audio files directly here: https://www.learningportuguese.co.uk/audio