The websites that you have there don't belong to TurboTax or Intuit. You would need to contact Costco for assistance with those.
Our download page for TurboTax Standard 2021 is: https://intuitglobal.intuit.com/downloads/CanadaTax/2021/dls/TurboTax_2021.exe
The software is currently only available as a 32-bit program.
