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The manual only mentions downloads to Windows computers not Macs.
MacBook Air 13″, macOS 14.4
You could also try importing video directly into iMovie:
Import into iMovie on Mac from file-based cameras - Apple Support
From p. 33 of the HM400 manual:
You may copy files from either the built-in memory or SD card. Refer to the folder layout that is also on p.33.
how to download video from JVC model GZ-HM400AA
