Unfortunately, we do not provide an online version of the software for filing your 2018 return. However, you can download the TurboTax software of your choice onto your Windows device by following this link - https://turbotax.intuit.ca/tax/software/prior-year-taxes?utm_source=google&utm_campaign=dsa_en&gclid...#tax-year-2018
Thank you for choosing TurboTax.
the link is to the Canadian site
Is there a similar way to download 2017, 2018, 2019 US home and small biz?
You will need to go to https://ttlc.intuit.com/turbotax-support/en-us/ to reach the US side.