Looking for (free) ImageMixer AVCD 3 edition for Hitachi hybrid camcorder, not upgrade.
Download the updater and double-click the downloaded file and follow the instructions on screen to execute installation.
http://www.pixela.co.jp/oem/hitachi/e/imagemixer3_avchd_edition_for_hitachi/data/IMX3AVCHD_H350001.exe - for Windows 7
http://www.pixela.co.jp/oem/hitachi/e/imagemixer3_avchd_edition_for_hitachi/data/ImageMixer3_AVCHD_3.30.006.exe - Windows XP & Vista
The software has also been supplied by default, for free, with your Hitachi hybrid camcorder, according to this Hitachi official webpage: http://dvdcam-pc.support.hitachi.ca/en/support/top.asp