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Once you enable site language (Settings > General > Language) that uses RTL orientation your site will enable RTL styles by default no matter what version you installed.
There is no special demo import for the RTL version because we used the default version to create the RTL website.
To get the default RTL Demo, just import the default version (XStore > Import Demos) > then set your language in site settings, and rtl styles will be applied.
This article will help you to translate the theme – https://xstore.helpscoutdocs.com/article/30-base-theme-translation
