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Hi,
Metronic v7 and Metronic v8 are considered as 2 different themes due to the Bootstrap 4 and Bootstrap 5 breaking changes and also our new core framework. So you will need to reintegrate Metronic v8 from scratch in order to migrate to Metronic v8.
For more info about using Metronic please check the Theme Documentation
and Video Tutorials
Regards.