AppID_Patch.exe

this guide is for batman arkham knight only

1 - Download AppID Patch V2 :
2 - Close Steam
3 - Open AppID Patch V2
4 - Click Browse and go to your steam installation folder which for me is : "C:Program Files (x86)Steam" and open the "appcache" folder and then select "packageinfo.vdf"
5 - Now you have to enter the AppID of the DLC you have downloaded and click patch for each AppID you enter.
6 - After this you have to edit the file "appmanifest_208650.acf" located in your steamapps folder and add the AppID + the Depots for each DLC you have under the MountedDepots section.
7 - Mine look like This, but you only have to add the lines where the AppID start with a 3 (367840 to 356620)
"MountedDepots"
{
"228983" "8124929965194586177"
"228984" "3215975441341951460"
"228990" "1829726630299308803"
"229004" "3575109949731994142"
"208651" "6522442799307181042"
"208652" "6576390859406408979"
"367480" "3606756076691948072"
"313100" "5055119973124847918"
"313101" "7031524843143162894"
"350170" "5484906920703570221"
"350171" "3987672753345161973"
"356470" "8758660712407517467"
"356471" "8937341487574903334"
"356474" "2459936110426243705"
"356620" "1824348795773659509"
}

8 - After that make the file "appmanifest_208650.acf" Read-Only.
9 - Launch the game and normally the DLC are installed.

If you lose you steam account don't blame me. I always use cracked steam or a new account for uncrackable games. If you do find you have complaints please forward them to the head of department at https://www.youtube.com/watch?v=H33Z_r0ayHs