The error message you encountered likely occurred because the theme/plugin package was in .rar format. WordPress only supports the installation of themes/plugins in .zip format, so you need to extract the contents of the .rar file first.
To do this, use a file extraction tool like WinRAR or 7-Zip to extract the contents on your computer. Once extracted, you should see a folder containing the theme/plugin files in .zip format. You can then upload and install this .zip file through the WordPress dashboard like any other theme/plugin.
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