On https://www.axisandallies.org/forums/index.php?topic=41138.msg1749669#msg1749669 I gave this advice:
Place the unzipped "world_war_i_1914"-folder with all its subfolders inside the "downloadedMaps"-folder of the TripleA installation.
In case you don't know where the "downloadedMaps"-folder is, start TripleA, hit "Engine Preferences" and then "Folders".
After that select "World War I 1914" from the games list.
Note that TripleA does not support the different mechanics introduced with the 1914 game.
Please try that. Good luck