Migrating from Windows to version 8

I have just installed version 8 and would like to migrate from my old vault to version 8. How do I do this. I did see the "how to" but since I did not see the "migrate data?" pop up when installing version 8, I now need to perform the migration.
Any help would be appreciated.
Many thanks

1Password Version: 4.6.2.626
Extension Version: Not Provided
OS Version: Windows 10.0.19043
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