@tinkoivan
There's two EU IMG maps because all of Western EU is now quite larger than 4 Gibibytes in one file, hence it's split between North and South for some years. So it's due to many Garmin devices using FAT32 which has a file size limit of 4 GiB minus 1 byte. Some older devices are even further restricted by the FAT16 limit of 2 Gib - 1 byte.