You would have to check your bank account or credit card for the charge. Didn't you buy it directly from Turbo Tax? If you bought it from Trubo Tax try here,
If you can't find your download, use this TurboTax account recovery website to get a list of user ID's for an email address. Run the tool against any email addresses you may have used https://myturbotax.intuit.com/account-recovery
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