On some configurations, downloading is blocked by firewall or antivirus. Try diable it or if you do not want (and you are right :) ), you can download the maps manually:

For BOTH server and client

  • You will need to download the following relief files and unzip it in your {Users}\LotAtc 4 DCS Data\ directory. (ex: C:\Users\DArt\LotAtc 4 DCS Data\relief.db)

For client only

  • You will need to download the following visual maps files and unzip it in your C:\Program Files\LotAtc 4 DCS\maps\ directory.