I do not think that it will be a problem - you might just want to ask the generatepress developer.
And Yes from that link I have tested few themes like - StoreFront, The Optimizer, TopShop and Arcade Basic. What I had found that they are not completely free. Take “The Optimizer” there are many features which are not enabled by default - like front page boxes. You might want to check themeforest for paid themes.
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