Hello, I figured that TurboTax does not support t1243 form. How should I submit it to CRA?

Unfortunately, TurboTax does not support this form, so you must submit it to the CRA website. 

If the fair market value of all property you owned when you left Canada exceeds $25,000, you will also be required to fill out a T1161 form.

You can print and mail these forms with your tax return to the Canada Revenue Agency (CRA). You can find the address on their website: Where to mail your paper T1 return

To download the T1243 form, please visit the CRA website:
T1243 Deemed Disposition of Property by an Emigrant of Canada - Canada.ca

To download the T1161 form, please visit the CRA website: 
T1161 List of Properties by an Emigrant of Canada - Canada.ca 

For more information, please visit our TurboTax article:

How Leaving Canada Affects Capital Gains | 2022 TurboTax® Canada Tips (intuit.ca)

Thank you for choosing TurboTax.