If you downloaded the CD/download software, you open up the program on your own computer from your own hard drive. You do not "log in" to online software.
https://ttlc.intuit.com/questions/1901659-find-your-tax-data-file-in-mac
https://ttlc.intuit.com/questions/1900721-find-your-tax-data-file-tax-file-in-windows
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