Yes, previously generated files can be downloaded from your history. To access this, first make sure you're logged into your account.
How to download files generated using Text to Speech
Select "Text to Speech" in the sidebar, then access your history by clicking the history tab in the panel on the right side of the screen. On narrow screens, you can access your history by clicking the history icon above the "Generate speech" button.
From your history, you can click the download icon to see the option to download as either an MP3 or WAV file.
How to download files generated using Voice Changer
If you're using the 'Simple' mode, you can access your history by clicking the 'History' tab on the left of the screen, next to 'Generate'.
If you're using the 'Advanced' mode, you can access your history by clicking the 'History' tab in the panel on the right side of the screen. On narrow screens, the History tab will appear on the left of the screen, next to 'Generate'.
You can click the 'Download' button to download any file from your history as either an MP3 or WAV file.