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The newest driver that Canon has put out for Mac is for Mojave. You can try and install that to see if your system will accept it. https://en.canon-me.com/support/consumer_products/products/cameras/digital_compact/powershot_sx_series/powershot-sx620-hs.html?type=download&language=&os=macos%2010.14%20(mojave)
Sorry, but that is the only option unless you allow Apple's software to use a generic one instead.
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