Express and NT(U) update does not delete old map related files, in the SQLite, JCV and SID folders large files are left behind. This seems the problem with Express for Windows and Mac versions of Express 3.2.4(?) with the latest update of City Navigator Europe NTU 2015.10 map.
Express updates the 2015.10 NTU maps on my zumo 390 and zumo 590 and it copies more than maps to the zumo and forgets to delete the old files. In the attached picture it shows the zumo 590 how it should bee.
In the zumo 390 I had one additional JCV file, 3 additional SID files and one DB file in the SQLite directories.
In the zumo 590 I had one additional JCV file, 4 additional SID files and one DB file in the SQLite directories.
The JCV and SID files are large and will give space problems in the future if not cleared by Express in the next versions.
I have manually deleted the files by using JaVaWa Device Manager to show the device, more information, Crossingoverview files and then clicked on show in Explorer or Finder, and deleted the files in the folders manually.
Folders:
?:\.System\JCV\
?:\.System\SID\
?:\.System\SQlite\?.DB