Copy the "ducatim900" folder (located in DLC folder) in your:

GAME DIR\mods\update\x64\dlcpacks

Then edit the "dlclist.xml" located in:

GAME DIR\mods\update\update.rpf\common\data
by adding:

<Item>dlcpacks:\ducatim900\</Item>
After:
<Item>dlcpacks:/mpchristmas2018/</Item>


Done.