OR--do you mean you used 2018 desktop software for last year and purchased the software from Amazon last year? If you used desktop software to prepare a tax return--no matter who you purchased it from--the tax files are stored on your own hard drive. They are not stored online anywhere.
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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