I want to migrate my archiviz map to VR Template map. but don't know how to do it. please guide me

The easiest way would be to migrate your level(s) to the new projects CONTENT folder. Unreal will grab anything that is referenced (used) in that level and migrate it as well.

Right click on the level in the content browser to migrate.

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but another erorr is now in project
plugin window is not opening