How do you test your app with a store that uses paid themes?

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Hey guys,

I developed a small app. I would like to test it on one of the paid themes.

Unfortunately, when I find the same theme on the store they are asking for 80$ to install it. When i login to my store and click "try it". I get following error:

Your change could not be processed

Make sure you’re logged in and try submitting your form again.

I am getting this error while logged into my development store. I think something else is broken.

Is there a way to test my app on this paid theme without paying for it?