Need Copy of EXE Install File for 2021 Turbotax Deluxe (WIN) to install on new computer

I bought 2021 T-Tac DLX (plus 1 state) for Windows from Costco in January 2022.  I need to install it on my new computer.  I have the email from Costco for the download but the link no longer works (I contacted Costco and the answer I have so far is - Sorry!)  I have the 16 digit auth code.  When I try to download the file from T-Tax using the auth code it says "Whoops! We hit a snag loading your data. Please try again."  As I said - I have the auth code, all I need is the download EXE file.  Where can I obtain a copy?