Here is a file less than 2GB for old devices like Nuvi660 for Balkans
Inside you will find the map with the covered areas Enjoy it.
A newer version of Combination of maps
City Navigator Europe NT 2016.20 (Balkans Region) +
Bulgaria OFRM Geotrade 2015 Q3 TOPO LAT +
Pegasus Greece (2015.05) Eng
The map is full routable