You can buy TurboTax Business Incorporated (for Windows 10 & 11 only) here: https://turbotax.intuit.ca/tax/software/business/business-incorporated
However, if you need to file a T3 Trust Income Tax and Information Return, then TurboTax can’t be used to prepare a T3 return. Intuit has another program called Profile OnePay that can be used. Profile uses EFILE, not NETFILE to submit returns, so you don’t have an EFILE account, you will need to print and mail your return. It is also for Windows only.
You can learn more about Profile OnePay on their website here: Profile Onepay - Single return tax preparation software