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How can I use assets cooked in an old version of UE4

We have some assets cooked in 4.8.3 packaged in .pak file.Now we want to update our engine version to 4.11,but we found we can’t use the files.Because we have a lot of scenes meshes and materials,and those assets have been uploaded to the server.So we don’t want to recook them.
So is there a way to let us can use those assets in the new version of UE4?