You should be able to do this via the Edition Upgrade option, I am sure we have done this.
Go to Microsoft SQL Server Configuration Tools, and navigate to SQL Server installation Center then click the Maintinance link and choose Edition Upgrade.
You should be able to put in your Standard Edition license key. You will have to restart SQL Server before it can take effect.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 14 Mar 2017
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