Importing Downloaded Blueprints

Hey Guys I downloaded a unreal project from the internet. When I opened that I noticed like I have compilation errors in almost every blueprints. The problem is all the variables are not compiled so I should delete that and get that variable and connect it again. This is impossible to do for almost 60+ blueprints. So is there anyway to open my project or do something else and remove all the blueprint compilation errors.

If you can see I have a error in the main menu reference. To solve this I have to delete that and get the main menu from the variables tab and reconnect the node. Hope you understand my problem.

Would Appreciate any help!!