Why would you need to do that?
2015 is no longer supported.
Also you cannot claim any refund for any tax year prior to 2018 since the 3 year statute of limitations has run out.
Are you amending a 2015 tax return for a tax refund? If so, it is to late to receive the refund for tax year 2015. The tax return with a refund had to be filed or before April 15, 2019.
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