@meimeiriver Thank you, sir, will do so...

I fixed the Item.
That fixed everything... 1 non-capital I messed ALL up...
Incredible!!!

And Eng16, indeed, typo.

Thank you all, I was going bananas.
My son kept hitting on me: "Is my GTA done, is my GTA done, daaaaaad..." LMAO

Well, NOW it is done.
All because I forgot to capitalize an I, for crying out loud!

Thank you all, SO much...
My son loves you guys!!!
And I am now again a happy daddy.

@chonkie

Replace police cars: files dropped in both Patch 3 and Patch 18.
Worked before.

DLCList:
<?xml version="1.0" encoding="UTF-8"?>

<SMandatoryPacksData>
<Paths>
<Item>platform:\dlcPacks\mpBeach</Item>
<Item>platform:\dlcPacks\mpBusiness</Item>
<Item>platform:\dlcPacks\mpChristmas</Item>
<Item>platform:\dlcPacks\mpValentines</Item>
<Item>platform:\dlcPacks\mpBusiness2</Item>
<Item>platform:\dlcPacks\mpHipster</Item>
<Item>platform:\dlcPacks\mpIndependence</Item>
<Item>platform:\dlcPacks\mpPilot</Item>
<Item>platform:\dlcPacks\spUpgrade</Item>
<Item>platform:\dlcPacks\mpLTS</Item>
<Item>dlcpacks:\mpheist</Item>
<Item>dlcpacks:\mppatchesng</Item>
<Item>dlcpacks:\patchday1ng</Item>
<Item>dlcpacks:\patchday2ng</Item>
<Item>dlcpacks:\mpchristmas2</Item>
<Item>dlcpacks:\patchday2bng</Item>
<Item>dlcpacks:\patchday3ng</Item>
<Item>dlcpacks:\patchday4ng</Item>
<Item>dlcpacks:\mpluxe</Item>
<Item>dlcpacks:\patchday5ng</Item>
<Item>dlcpacks:\mpluxe2</Item>
<Item>dlcpacks:\patchday6ng</Item>
<Item>dlcpacks:\mpreplay</Item>
<Item>dlcpacks:\patchday7ng</Item>
<Item>dlcpacks:\mplowrider</Item>
<Item>dlcpacks:\mphalloween</Item>
<Item>dlcpacks:\patchday8ng</Item>
<Item>dlcpacks:\mpapartment</Item>
<item>dlcpacks:\mpxmas_604490</item>
<Item>dlcpacks:\mplowrider2</Item>
<Item>dlcpacks:\mpjanuary2016</Item>
<Item>dlcpacks:\mpvalentines2</Item>
<Item>dlcpacks:\patchday9ng</Item>
<Item>dlcpacks:\mpexecutive</Item>
<Item>dlcpacks:\patchday10ng</Item>
<Item>dlcpacks:\mpstunt</Item>
<Item>dlcpacks:\patchday11ng</Item>
<Item>dlcpacks:\mpimportexport</Item>
<Item>dlcpacks:\mpbiker</Item>
<Item>dlcpacks:\patchday12ng</Item>
<Item>dlcpacks:\patchday13ng</Item>
<Item>dlcpacks:\mpspecialraces</Item>
<Item>dlcpacks:\mpgunrunning</Item>
<Item>dlcpacks:\mpairraces</Item>
<Item>dlcpacks:\mpsmuggler</Item>
<Item>dlcpacks:\patchday14ng</Item>
<Item>dlcpacks:\patchday15ng</Item>
<Item>dlcpacks:\patchday16ng</Item>
<Item>dlcpacks:\ssc_gauntlet</Item>
<Item>dlcpacks:\uparmorhmvdes</Item>
<item>dlcpacks:\bdivo</Item>
<Item>dlcpacks:\countachus</Item>
<Item>dlcpacks:\610dtm</Item>
<Item>dlcpacks:\lamtmc</Item>
</Paths>
</SMandatoryPacksData>

Extra:
<?xml version="1.0" encoding="UTF-8"?>

<SExtraTitleUpdateData>
<Mounts>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcSPUpgrade:/</deviceName>
<path>update:/dlc_patch/spUpgrade/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPBeach:/</deviceName>
<path>update:/dlc_patch/mpBeach/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_MPChristmas:/</deviceName>
<path>update:/dlc_patch/mpChristmas/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPValentines:/</deviceName>
<path>update:/dlc_patch/mpValentines/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPBusiness:/</deviceName>
<path>update:/dlc_patch/mpBusiness/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpBusiness2:/</deviceName>
<path>update:/dlc_patch/mpBusiness2/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPHipster:/</deviceName>
<path>update:/dlc_patch/mpHipster/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_MPIndependence:/</deviceName>
<path>update:/dlc_patch/mpIndependence/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPLTS:/</deviceName>
<path>update:/dlc_patch/mpLTS/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPPilot:/</deviceName>
<path>update:/dlc_patch/mpPilot/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_patchDay1NG:/</deviceName>
<path>update:/dlc_patch/patchDay1NG/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpPatchesNG:/</deviceName>
<path>update:/dlc_patch/mpPatchesNG/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpChristmas2:/</deviceName>
<path>update:/dlc_patch/mpChristmas2/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPHeist:/</deviceName>
<path>update:/dlc_patch/mpHeist/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_MPLuxe:/</deviceName>
<path>update:/dlc_patch/mpLuxe/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_patchDay3NG:/</deviceName>
<path>update:/dlc_patch/patchDay3NG/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_patchDay5NG:/</deviceName>
<path>update:/dlc_patch/patchDay5NG/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpLuxe2:/</deviceName>
<path>update:/dlc_patch/mpLuxe2/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpLowrider:/</deviceName>
<path>update:/dlc_patch/mpLowrider/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlcMPHalloween:/</deviceName>
<path>update:/dlc_patch/mpHalloween/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpApartment:/</deviceName>
<path>update:/dlc_patch/mpApartment/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpJanuary2016:/</deviceName>
<path>update:/dlc_patch/mpJanuary2016/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpValentines2:/</deviceName>
<path>update:/dlc_patch/mpValentines2/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpLowrider2:/</deviceName>
<path>update:/dlc_patch/mpLowrider2/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpExecutive:/</deviceName>
<path>update:/dlc_patch/mpExecutive/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpStunt:/</deviceName>
<path>update:/dlc_patch/mpStunt/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpBiker:/</deviceName>
<path>update:/dlc_patch/mpBiker/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpImportExport:/</deviceName>
<path>update:/dlc_patch/mpImportExport/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_mpGunRunning:/</deviceName>
<path>update:/dlc_patch/mpGunrunning/</path>
</Item>
<Item type="SExtraTitleUpdateMount">
<deviceName>dlc_countachus:/</deviceName>
<path>update:/dlc_patch/countachus/</path>
</Item>
</Mounts>
</SExtraTitleUpdateData>

Both DLC and Extra are placed in Update.RPF, DATA.

Need anything more, good sir?

Will do ASAP, not on my son's system atm.
Thank you very much.

@chonkie
I ended up reinstalling everything except the OIV.
Same deal...
Scripthook is installed.
Scriphook.net.
Dinput8.
Installed the correct gameconfig.
Edited the DLC and Extra files as per needed.
Installed the directories with their DLC files.
Installed a few police car replaces.
But no ball...

I am at a loss, what am I missing?

Oh...
Well, I'll remove these then.
See if that helps.

Thank you, sir.

@chonkie Well, one moment they worked fine.
Nothing changed on the system, the game.
Oh, right, my son had a car installed, https://www.gta5-mods.com/vehicles/2015-lamborghini-aventador-lp700-4-stock-interior-color-hq-animated-engine-livery-tunable-autospoiler.
An OIV.

Then out of the blue, all added mods just stopped working.
Trainer works, still, which is VERY strange.

I tried to re-install with redownloading all needed mod-files, I changed the Config again, nothing though helps.

No one with an idea of what it could cause this?

Out of the absolute blue, all mods decided to quit working on my son's GTA.
Cars, person skins, the whole shabang just is not there anymore.
Replaced all Scripthook files etc, no avail, game refuses to accept the mods, for some odd reason.
Anyone a clue?

Thank you.

@Sammy1970 Just what do I need to copy over?
My last attempt went nowhere...