For those who want to mod after the VAC warning update,here’s the instruction.

1.create a folder under your game directory named dota_xxx(replace 'xxx' with your custom mod name)

2.create a simpler version of gameinfo.gi as this and put it into the folder dota_xxx:

​

"GameInfo"
{
    LayeredOnMod    dota

    FileSystem
    {
        SearchPaths
        {
            Game                dota_xxx(replace 'xxx' with that folder name above)
            Game                dota
            Game                core

            Mod                 dota_xxx(replace 'xxx' with that folder name above)
            Mod                 dota

            AddonRoot           dota_addons

            // Note: addon content is included in publiccontent by default.
            PublicContent       core
        }
    }
}

3.put your mod pak01_dir.vpk into the folder xxx (replace 'xxx' with the folder name you provided )4. now add -language xxx (replace xxx with folder name above) launch option to dota and start dota then you should see the mod effects and no more vac warning.