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How to upgrade an existing nvQuickTheme to a newer version of nvQuickTheme

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First I want to thank you for making nvQuickTheme available as an open source project, as this is a great DNN theme development tool.

So I started designing my first DNN theme using nvQuickTheme v2.1.0. I would like to upgrade the project to utilize some of the new features in v2.2..0. I am sorry if this has been covered in the past, but I can't find any info on how to upgrade an existing theme to a newer version of nvQuickTheme. Could you please point me in the right direction?