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video driver upgrade

  1. N

    Imac 21.5 Inch

    Hi Just bought brand new Imac 21.5 inch. Tried to download LumenRT Viz 2015 and get an error message to say system will freeze or crash need to upgrade video driver. Have hunted all over to find out how to upgrade video driver but no luck, possibly also not knowledgeable enough. Can...
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