Need help? Yet it is quite easy if you read a bit first.
When you know what maps you need (Europe? part of? USA? Australia? somewhere else? if you had told us, we might give a alive link) look for them in the map section. You know where that is, it's where you - strangely enough - did not not read anything but asked your question.
When you found the map(s) but the link/s is/are dead:
general-discussions-about-igo-core-f87/dead-links-t10721.htmlYou don' know how to download :
general-discussions-about-igo-core-f87/download-hosting-site-secrets-t9868.htmlWhat you want more? Where to put the maps? There is a thread about it. In the map section
The new maps are downloaded and installed, however aren't found? It's written at least 20 times on this forum (I admit, searching is a bit difficult here) that you need a cracked program and the proper licenses, esp. when NextGen is your program - which we don't know.
Clear now? Now it's up to you, do not expect us to hold your hand all the time.