No – Sonru is an online Flash application and you will not need to download any specific Sonru application to your computer.
However, you will need the latest version of Adobe Flash Player in order to use the application. If you do not have Flash Player Installed, or need a more recent version, you will be prompted to download and install it which you can do here Get flash player
You can read more about the version of Flash required here.
If you still have problems just get in touch with Sonru Support.
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