It looks like you are trying to upload PSD files like a theme but it is incorrect. PSD – Photoshop Image File Format https://docs.fileformat.com/image/psd/ Such files can be opened via Photoshop , but not loaded in WordPress, so you are trying to instal the wrong archive. Read this article one more time – https://help.market.envato.com/hc/en-us/articles/202821510-Theme-is-missing-the-style-css-stylesheet-error
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