dpp
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Canon DPP v4.15.20 released with support for R3
Release notes state that the R3 is supported. https://www.canon-europe.com/support/consumer_products/products/cameras/digital_slr/eos-r3.html?type=software&language=en Edit: so it seems that you can't get it from the the canon-europe site, but you can get it from the canon.dk site...