You can download some software for the Vixia HF R100 here: https://www.usa.canon.com/internet/portal/us/home/support/details/camcorders/support-high-definition-camcorders/vixia-hf-r100 . However, ImageMixer 3 SE is third-party software that is only available on the driver disc that came with the camera. Some companies will send you a replacement disc for a small fee. You'll need to contact Canon support, https://www.usa.canon.com/internet/portal/us/home/support/ , to ask if they have discs available.
ImageMixer 3 SE is available here: http://www.pixela.co.jp/oem/canon/e/imagemixer3_se_canon/ . However, this is only for updating the software on a computer that already has the program installed.
Answers & Comments
You can download some software for the Vixia HF R100 here: https://www.usa.canon.com/internet/portal/us/home/support/details/camcorders/support-high-definition-camcorders/vixia-hf-r100 . However, ImageMixer 3 SE is third-party software that is only available on the driver disc that came with the camera. Some companies will send you a replacement disc for a small fee. You'll need to contact Canon support, https://www.usa.canon.com/internet/portal/us/home/support/ , to ask if they have discs available.
ImageMixer 3 SE is available here: http://www.pixela.co.jp/oem/canon/e/imagemixer3_se_canon/ . However, this is only for updating the software on a computer that already has the program installed.
I hope this helps.
Cindy Wells