1. Download demo content -> https://drive.google.com/drive/folders/1zlooA3nv_phkXRgeTrx1-zOEb9idg5QW?usp=sharing (demo-onecommunity.zip file) and unzip it.
2. Go to Plugins -> Add New and install the All-in-One WP Migration plugin.
3. Go to All-in-One Migration -> Import -> Import from: File and upload the demo-onecommunity.wpress file. 
4. Resave permalinks.

If you have problems with installation then try to install the lite version - demo-onecommunity-lite.wpress
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Login to your WP Dashboard is following:
admin
d3d2eiedk7
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Don't forget to change the e-mail address of you website. Also you can go to Settings -> Reading and disable "Discourage search engines from indexing this site". 