If you are using the downloaded version - please uninstall the original version, and reinstall using the link provided here: https://turbotax.intuit.ca/product/download/index.jsp . With the same IKC provided with the original download.
If you are signing in online, then you will need to clear your browser cache with instructions below and try again:
How do I clear my cache (browsing history)?
For further personal assistance, please review the link below to contact our support team:
I want to talk to someone. How do I phone you?