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This is a paid asset, but now you can download Simple Cross-Promotion Free.
Detail this asset from Unity Store: Original Link
Simple Cross – Promotion v1.0
Simple tool with 1-click install to promote your games!
The promoted app is set remotely in JSON descriptor and can be changed any time without app re-upload to stores.
All settings and colors (frame color, button color and others) can be configured in JSON.
Works on any platform.