I have a Garmin Nuvi 270 with lifetime Europe and U.S. maps. Garmin Express has no problem installing the U.S. map. I can even install the map on an SD card using the "cloning method" described here: http://www.poi-factory.com/node/39231
However, no matter what I try, I cannot install the Europe maps. Garmin Express just gives me the cryptic "There was an error installing the update".
How do I fix this?