No, you can’t install more than one copy of TurboTax on your computer for the same tax year.
If you want to file more tax returns
If you want to file more tax returns than the number that's included in your copy of TurboTax, you can buy more tax returns.
Note: The CRA has a limit of 20 tax returns per computer or online account for all NETFILE-certified tax preparation software products in Canada. For more information, visit the CRA: 20-tax returns limit page.