When it is opened open the "Addon Options" at the top of the application press the "+" icon on the right side on the "Addon Search Directories".
After you click the + button navigate to your Arma 3 files you can find this by going to your main drive, "program files (x86)", "Steam", "steamapps", "common" and select the "Arma 3" folder and hit open.
After that, click on the "Repositories" at the top, click the "+" option and put ftp://188.8.131.52/.a3s/autoconfig in the "Public auto-config url" and hit import then click "OK".
Next, select the repository you just added and hit the paper with an arrow on it, this should then open another page and be "checking files".
Ensure that the "Default destination folder" is set to the file you just added, it should be C:\Program Files (x86)\Steam\steamapps\common\Arma 3 and after it has checked the files it should come up in the repository content with a file called "@ANZUSGaming Los Diablos Roleplay" with a yellow warning triangle, check the box just on the left of that icon and hit the "play" button on the left. It will then start to download the mods for you and put it into the correct place.
When that is finished downloading go to your Arma 3 launcher and go to the mods section, then click on the "+Local Mod", navigate to your Arma 3 folder through the program files, steam, steamapps, common, Arma 3 and then select the "@ANZUSGaming Los Diablos Roleplay" file. It will then load in and you need to select it.
Hit the big play button and load in!
Download WinRAR by following this link: Click Here
When you have that fully installed, Click Here and download the Anzus Mods.
Open the folder that your download is held, then right click the file, selecting the WinRAR or 7zip option to "Extract to" where it displays a folder name the same as the file.
Once it has extracted, check to see if that folder contains another folder or has a list of folders/items such as "Addons", "Teamspeak", etc.
If the folder has another folder,, then select that folder and move it to where you extracted the folder.
If the folder has Addons/Teamspeak/etc folders, move to next step.
Open the Arma 3 Launcher, go to the Mods menu, then click the "+Local Mod" button. Select the folder as provided in the step(s) above.
Once the mod has loaded into the Launcher, make sure to enable it by pressing the tick box and disabling any other mods.
Hit the large yellow play button and enjoy anzus!
Any major issues you can watch this installation video Click Here