Quicktime for Windows can be downloaded from here but do please note that it is no longer supported by Apple and has not been updated since 2016. Only install the parts of the app that you actually need.
QuickTime Movie export is only available in Movie Edit Pro (VideoDeluxe) 2019 and earlier versions, with the proviso that Quicktime is installed.
Movie Edit Pro, now called Movie Studio, (VideoDeluxe) 2020 and later versions cannot export to Quicktime Movie format - the closest and more versatile format is MP4 h.264/AVC encoding.