Well, ideally user should not tinker with manual transfer and installation of maps; normally this should be done in more-or-less automated way with Map Transfer Tools, supplied with SB. Also it is worth to get familiar with part of User Manual describing the file structure of Steel Beasts (for current revision- pages 23-27, and regarding map packages- 25-26). You can access manual via eSim Games- Steel Beasts Pro entry in Start menu (if you are using Win 11, then in order to see it you need to pick 'All apps' option), or by going to C:\Program Files\eSim Games\SB Pro PE\docs.
What is not mentioned in manual:
1) eSim Games- Steel Beasts Pro entry in Start menu contains quick access shortcut to your maps folder. Alternative- launch SB, in Main Menu pick Options then File Paths; you will be able to see folder address. Also keep in mind that C:\ProgramData\ is hidden by default.
2) If maker of scenario for whatever reason included map package to a archive with scenario instead of uploading map to server, you should manually copy-paste this package to maps folder, and probably it would work. Just make sure that scenario was downloaded from '4.1+ Single Player Scenarios'.
If scenario does not work:
a) it is pre-4.1 scenario likely downloaded from 'Multiplayer Scenarios' section, and map requires conversion(also may be you would need to manually download it from ' Pre-4.1 Maps' section of 'Downloads'). That isn't hard, and we have a pinned thread on subject:
Legacy map is relatively easy to identify, since it is composed of just two map files and optional theme file:
-.hgt for height map, should be copied to C:\ProgramData\eSim Games\Steel Beasts\maps\height
-.ter for terrain map, C:\ProgramData\eSim Games\Steel Beasts\maps\terrain
- optional .thm file, which should go to C:\ProgramData\eSim Games\Steel Beasts\maps\themes
b) it is 4.1+ scenario, but map is unpublished. Well, you would need to open map in Map Editor and pick 'Publish' option in order to make it read-only and usable for normal gameplay sessions
c) it is 4.1+ scenario, but map package provided by scenario maker is a delta package (e.g. contains only changes relative to base map). Here things may get tricky, if base map is not available for download from our server, and not a part of map installer. In this case it might be better to contact maker of scenario and ask for instructions where to get base map.