Hi @Maple-Michelle1,
I think the "clicked an element" method is probably the easiest one to use. However, there are other ways. You could use a custom code modification in the VEC (or via a form composed test) to add a small JS that inserts an onclick action on the button/link to fire an adobe.target.trackEvent(). This allows you to create a custom mbox name and then in the goals settings you pick conversion > viewed an mbox. Then select the custom mbox name in the trackEvent(). This also allows you to add custom parameter to the request if you want to further qualify the conversion in some way. Something like this would do:
document.querySelector('#playStoreButton').addEventListener('click', function(event) {
adobe.target.trackEvent({mbox:'clickCapture', params:{'param1':'value1'}});
})