looking at your history, I think This is as close as you're going to get. Its a re-done version of fakeplastics original mod.

Well in order for you to find out if someone has it, at the very least you need to tell us what it is. But no, once a mod has been deleted by the owner it is gone. The "Developers" you seem to refer to don't exist. Every mod that is on this site is individually managed by the author. The site owners and moderators have nothing to do with their development, beyond approving the files for publishing when a new mod is uploaded.

unless you can somehow get the files from the author without contacting the author then yes, there is nothing you can do. What were you expecting to happen? If the mod has been deleted by the author then its gone

The setup file if auto generated by a dlcpack tool should be okay, but if you copied it from another mod may have the incorrect name references in there. the content file should declare the file names, types and locations of every meta file within the dlcpack

then you're out of luck. The "developers" are the content creators responsible for uploading the mod. If the author is no longer active then there is nothing that can be done.

first place I would be checking is the content and setup xml files to make sure that they are declaring the file correctly. You can also search your openiv.log for the dlcpack name to check that it is correctly loading the directory when the game is launched

Did you add the name of the dlcpack to your dlclist.xml file? As that seems to be missing from your procedure.

There are thousands of mods, all with their own ID's. At present, the highest modkit currently in use by official Rockstar DLC is 445. There are some spaces below that, but on the balance of probability you are safer to go higher than that. Do not go higher than 1024 or you risk conflicting with modkits at the lower end of the ID scale.

try it and find out.

yes it is just scripthook needed. very little has changed, you can copy version.txt and the christmas2017 dlc_patch to get the updates

@Animale new scripthook is working fine. Something else is wrong with your game if you're getting a fatal error