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I didn't use de module manager. First I tryed to use the updater.
The updater ended with a pop up error message (happened with other several people of this forum too).
When I noticed the updater wasn't working, I uninstalled the DCS World, BS2, FC3 and CArms.
Then I downloaded the standalone installers. When I tryed to reinstall, the installer didn't let me install on the same folder the old (1.2.3) version was installed.
Then I created a new folder and installed the new 1.2.4 version of DCS World. It worked (at that moment I had both versions installed).
Then I installed CArms standalone. It worked but the ground units didn't lock their weapons.
Then, I tryed to install FC3 standalone, but the installer kept closing itself seconds after openning. So, I tryed to install BS2 standalone, and it kept closing too.
I lost my patience and then uninstalled version 1.2.4 and 1.2.3.
Since then, I am not able to install neither the 1.2.3 nor the 1.2.4 DCS World because EVERY standalone installer closes itself just after oppening.
(I use Windows XP SP3)
I'm thinking of reinstalling windows but I don't want to do that...