You can download our TurboTax download edition (for Windows) from our website. Note, you'll need to purchase it to be able to run it.
If you've already started an online TurboTax return, there's no way to transfer your info (or your purchase, if you pre-paid) from the online version to the download version.
Download from here: https://turbotax.community.intuit.ca/replies/3001486
You can purchase the download edition from here: https://turbotax.intuit.ca/personal-tax-software/download-tax-software.jsp