You were using desktop software to prepare a 2018 return? The CD is not where the tax return file is stored. The tax file is saved on your own hard drive. You did save it, right? And if you still have the program installed on your computer, it should not even matter at this point if you cannot find the CD.
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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