Click on the Download option at the top, and OneDrive will now download all files to the PC at once. It worked just fine for me on my Windows 11 PC and here is the screenshot.

To download Audacity, you'll just need to head to the Audacity downloading hub, which you can reach through the official Audacity website. There are separate Audacity download files for Mac and PC.

Any files or folders you download from OneDrive will be available in your computer's Downloads folder or whatever location your web browser stores downloaded files.

Wait until the conversion is completed. Then you'll see three button options. The first option is "Download," which downloads the audio file to your computer's default downloads folder.