Something seems to be wrong with the installation.
I downloaded AOD 1.12 on Steam.
I downloaded
CORE2_0_7_0_8.exe from the first post in this thread.
I installed
CORE2_0_7_0_8.exe in the Steam > steamapps > sourcemods folder
I downloaded the file in post #102 of this thread.
I extracted that file, and moved its contents to the mod-CORE2 folder, overwriting the existing files.
I went into Steam, and typed "mod-CORE2" into the Launch Options
I launched AOD, and in the top right, just under where it shows "Arsenal of Democracy 1.12 (XEAV)" it displays "mod-CORE2".
I click Single Player.
There are no scenarios available to select.