Hi,
My colleagues and I have spent many hours on this one and cause of problem, in this case, was compressing files,
or using windows explorer ( or some other software) to compress ( create zip) file.
Compressing add ins and sending zip file to another PC, unzipping and trying to load add ins can create this wierd message about digital signature.
Compressing file, probably, does something to ownership/permissions I can understand that MicroStation "refuse" to open files but Bentley should change this misleading mesage about digital signature because it has nothing to do with this case.
MicroStation should "ask" user if files shoud be thrusted ( since owner is "unknown")
Hope, someone vil find this info usefull
best regards,
Nenad