Wollte mal ausprobieren, ob es an mkgmap liegt, aber ich komme schon mit dem installatierten Beispiel nicht weiter.
Ich habe map_composer_102.zip und mc_starthilfe_100.zip in das gleiche Verzeichnis ausgepackt und dann start_x64.bat aufgerufen.

In errorLog.txt findet man folgendes:

14.12.18 11:18 javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
14.12.18 11:18 Exception reading data from downloaded file
javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
	at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source)
	at nop.osm.OSMInputFile.openXmlStream(OSMInputFile.java:167)
	at nop.osm.OSMInputFile.<init>(OSMInputFile.java:142)
	at nop.osmc.generator.RegionMapper.downloadRegion(RegionMapper.java:100)
	at nop.osmc.generator.Mapper.generate(Mapper.java:195)
	at nop.osmc.MapComposer$13.act(MapComposer.java:425)
	at nop.gui.MenuThreadAction.run(MenuThreadAction.java:27)
	at java.lang.Thread.run(Unknown Source)
14.12.18 11:18 javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
14.12.18 11:18 Exception reading data from downloaded file
javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
	at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source)
	at nop.osm.OSMInputFile.openXmlStream(OSMInputFile.java:167)
	at nop.osm.OSMInputFile.<init>(OSMInputFile.java:142)
	at nop.osmc.generator.RegionMapper.downloadRegion(RegionMapper.java:100)
	at nop.osmc.generator.Mapper.generate(Mapper.java:195)
	at nop.osmc.MapComposer$13.act(MapComposer.java:425)
	at nop.gui.MenuThreadAction.run(MenuThreadAction.java:27)
	at java.lang.Thread.run(Unknown Source)
14.12.18 11:18 java.lang.ArrayIndexOutOfBoundsException: -1
14.12.18 11:18 Exception analyzing data for Wertheim
java.lang.ArrayIndexOutOfBoundsException: -1
	at nop.osm.nodetree.TreePage.getLess(TreePage.java:84)
	at nop.osm.nodetree.NodeTree.copy(NodeTree.java:297)
	at nop.osm.nodetree.NodeTree.copyTo(NodeTree.java:289)
	at nop.osmc.generator.Analyzer.standardAnalysis(Analyzer.java:166)
	at nop.osmc.generator.Analyzer.analyze(Analyzer.java:81)
	at nop.osmc.generator.Mapper.generate(Mapper.java:208)
	at nop.osmc.MapComposer$13.act(MapComposer.java:425)
	at nop.gui.MenuThreadAction.run(MenuThreadAction.java:27)
	at java.lang.Thread.run(Unknown Source)
14.12.18 11:27 javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
14.12.18 11:27 Exception reading data from downloaded file
javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
	at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source)
	at nop.osm.OSMInputFile.openXmlStream(OSMInputFile.java:167)
	at nop.osm.OSMInputFile.<init>(OSMInputFile.java:142)
	at nop.osmc.generator.RegionMapper.downloadRegion(RegionMapper.java:100)
	at nop.osmc.generator.Mapper.generate(Mapper.java:195)
	at nop.osmc.MapComposer$13.act(MapComposer.java:425)
	at nop.gui.MenuThreadAction.run(MenuThreadAction.java:27)
	at java.lang.Thread.run(Unknown Source)
14.12.18 11:27 javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
14.12.18 11:27 Exception reading data from downloaded file
javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,50]
Message: Leerstellen erforderlich zwischen publicId und systemId.
	at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source)
	at nop.osm.OSMInputFile.openXmlStream(OSMInputFile.java:167)
	at nop.osm.OSMInputFile.<init>(OSMInputFile.java:142)
	at nop.osmc.generator.RegionMapper.downloadRegion(RegionMapper.java:100)
	at nop.osmc.generator.Mapper.generate(Mapper.java:195)
	at nop.osmc.MapComposer$13.act(MapComposer.java:425)
	at nop.gui.MenuThreadAction.run(MenuThreadAction.java:27)
	at java.lang.Thread.run(Unknown Source)
14.12.18 11:27 java.lang.ArrayIndexOutOfBoundsException: -1
14.12.18 11:27 Exception analyzing data for Wertheim
java.lang.ArrayIndexOutOfBoundsException: -1
	at nop.osm.nodetree.TreePage.getLess(TreePage.java:84)
	at nop.osm.nodetree.NodeTree.copy(NodeTree.java:297)
	at nop.osm.nodetree.NodeTree.copyTo(NodeTree.java:289)
	at nop.osmc.generator.Analyzer.standardAnalysis(Analyzer.java:166)
	at nop.osmc.generator.Analyzer.analyze(Analyzer.java:81)
	at nop.osmc.generator.Mapper.generate(Mapper.java:208)
	at nop.osmc.MapComposer$13.act(MapComposer.java:425)
	at nop.gui.MenuThreadAction.run(MenuThreadAction.java:27)
	at java.lang.Thread.run(Unknown Source)