Hello,
Answer from PG:
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It should have never been on the v11 DVD. The migration tool only worked in the SaaS environment and there are checks in the extension for it to only be available in SaaS. It is also only available for certain countries too.
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That said, this is the reason you cannot find it. it does only work in the online version of Dynamics 365 BC release and it was a mistake that we also shipped it with the OnPrem release.
Apologies that we shipped the extension with Dynamics NAV 2018.
Thanks.