How to handle "Invalid CRC" ?

[Stargazed-Dreamer]

I'm trying to help one of my friend to edit something of his save files (EPIC version). But all the save files of DLC part can't be decrypt by the key "Epic.OnlineServices.EpicAccountId". The tool reported "Invalid CRC". I noticed that the names of these DLC save files are different from what I have. Here is a screen shot of his save file.

And the files Saves.zip