Same problem for me, since the installation of version 12.8 (which should have guaranteed a higher speed of downloading the media of the various games), at least 50% of the images are not downloaded and generate errors as in your case. If I repeat the procedure, telling LaunchBox to download only the missing media, it can perhaps download another 20%, but even repeating the operation several times you can not get all the images, as happened in the past.
Image Errors.
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Same problem for me, since the installation of version 12.8 (which should have guaranteed a higher speed of downloading the media of the various games), at least 50% of the images are not downloaded and generate errors as in your case. If I repeat the procedure, telling LaunchBox to download only the missing media, it can perhaps download another 20%, but even repeating the operation several times you can not get all the images, as happened in the past.