Following the launch of MetaHuman Creator app with UE5-based characters, you will not be able to access UE4 characters in Bridge for UE5. This includes any previously downloaded UE4 characters on your disk. Please note, adding UE4 characters to a project with UE5 characters is discouraged and may result in unexpected issues.
Any characters that you may have created using the UE4 version of MetaHuman Creator app are available for re-downloading as UE5 characters in My MetaHumans view.
Similarly, you will not be able to access the UAsset version of UE5-based characters in standalone Bridge app, and will need to use Bridge in UE5 to download and add UE5 characters to your project.