If you are having issues with the download link originally sent via email, please uninstall the software from your computer, then reinstall using this link instead: https://turbotax.intuit.ca/product/download/index.jsp and enter in the 21 digits IKC given to you in the original email.
Here are directives in how to uninstall the software (if needed):
How do I uninstall TurboTax from my computer?