Yes, it will most likely be because of that. One suggestion I could make then is to install this
http://cid-fabdddc5cad93494.skydrive.live.com/self.aspx/Public/LiveWriterBackupSetup2010b.msi on your original machine (the one with the old writer). This is the original backup tool. You can then use the newer backup tool on the new pc to restore the settings how the new live writer expects them.
SL - Windows Live Platform MVP
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