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How To Install a mod for ArmA.
You should first read the background for OFP mod installing, which is basically general overview.
On top of that knowledge, you should also read the usage of -profiles parameter (mod dir stuff) so you know how to load up the mod directories properly.
After you have downloaded VTE archive, you should download the Extended Event Handlers (XEH) archive too. You should put XEH into its own mod dir and VTE its own. In our example we call the XEH dir x\xeh and VTE dir x\vte, your directory structure would look like this:
<arma_root>\x\ <arma_root>\x\xeh\ <arma_root>\x\xeh\addons\ <arma_root>\x\vte\ <arma_root>\x\vte\addons\
You will unpack the addon pbo files into the <…blabla>\addons\ directory.
When you have unpacked all the first, run ArmA with a command line to point into these mod dirs, for example like this:
arma.exe -mod=x\xeh;x\vte -nosplash -world=VTE_intro -profiles=d:\ArmA