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@Nana Nishijima ,
Based on the description in the original post, It looks like you are referring to the EdgeHTML version. (Please correct me if I misunderstand here.)
I try to check the documents and found that,
The EdgeHTML 17 was released with the Windows 10 April 2018 Update (04/2018, Build 17134).
The EdgeHTML 18 was released with the Windows 10 October 2018 Update (10/2018, Build 17763).
References:
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