TurboTax for tax year 2017 is now available!
You can find online editions of TurboTax here: https://turbotax.intuit.ca/personal-tax-software/online-tax-software.jsp
Download editions (for Windows) are here: https://turbotax.intuit.ca/personal-tax-software/download-tax-software.jsp
And, if you've already purchased and are just looking to download, you can do that from here: https://turbotax.community.intuit.ca/replies/2647907