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Crashing on importing 4.17 Blueprints into a 4.18 project

I tried pasting through windows, blueprints from a old 4.17 project into 4.18 but when I do that it crashes when I try to open the 4.18 project, any ideas why?

Have you tried migrating the assets?

I copied and pasted the blueprint files into UE4 through Windows. Does UE4 have some special migrate tool or something?

I can’t open the old 4.17 project either since it says;

The following modules are missing or built wtih a different engine version;

UE4Editor-TFire_MinScale.dll

Would you like to rebuild them now? And yes never works, saying it failed I should rebuild manually but no just closes it.