Is there any XIN version problem at BRT SS4?

Today I just update BRT to SS4 version. It includes Halfsine spiral which is good for me.

But very soon I find a very big problem, I can't use my previous XIN file. I can open it but it's nothing there. I try to open Tools/Copy Preferences, pick my previous XIN file. But BRT tells me that "is not a valid XIN file".

Can any one please let me know how to fix it? Thank you! 

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