For all of you who may be wondering, if you only added the game to your collection but did not donate at least $1 USD, then no, the updates are not free. If you donated at least $1 USD, then you technically purchased it, and there is a download button on your "my collection" page that allows you to get the updates. I double checked this myself by making another account and adding the game to my collection but not donating for it, and that account does not have the download button on the collection page, but this account (which I did donate on) does.