Looks like the file name is wrong JMRI.4.12.Rb6a9bb1. should be JMRI.4.12+Rb6a9bb1 ( + and not . ).
Hopefully Bob or another developer can change this soon.
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Peter Ulvestad
JMRI Users Group Moderator - ( )
Tam Valley Group Moderator - ( )
Sprog-DCC Group Moderator - ( )
Edmonton Model Railroad Association -