The option to change the layout is only available in the pro version . Since you have already purchased the pro version you can build your test site using the pro and use the feature of changing the layout .
For the personal use you may re-use the theme as much as you like .But if you are thinking of using it in a paid service then you must purchase one license for each site. Alternatively if you are not using for professional purpose then you can use the theme multiple time .
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