Experiment with adding some strategic iconography to your primary button. Choose actionable icons, such as forward-facing arrows, that suggest to the user that something expected is about to happen next as a result of clicking on it. For downloads, you might test out a down-facing arrow or even file type icons, such as the Adobe pdf icon. Actionable icons can reinforce anticipation, or even set expectations and can help persuade your visitors to take the next step.
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