AND... this is because of the last minute (late December) antics of Congress, passing extenders & making them retroactive. IRS had to re-tool, as did Intuit. Getting 2018 'fixed' was less of a priority than getting 2019 'fixed'.
Congress - ALL of them - need to be fired (IMHO...)
@AshleyatIntuit aka Henry Jr I just tried to update 2018, told me there were no updates and it wont transmit, says it needs to be updated...so I think your link is a bit premature for ProSeries. Or do we need to use the Update repair tool maybe?