this is a video I made showing you step by step on how to setup multiplayer with a modded map, you will also need jsgme for this, link for jsgme is down below
@skull0fd3ath, Thanks for the video
@dan4762, I've got spintiresmod working, it won't work with sweetFX installed, but I can't get Blackwater Canyon working in MP. I still get the files different error when trying MP.
EDIT: Even tho I got spintiresmod working, since I already installed it, I still question it because of the malware that came up when checked with VirusTotal. Just so everyone knows, Virustotal is showing that it's malware. I already installed it so it's too late for me, just a headsup for everyone else. It could be a false positive but I just checked this other guys mod manager with VirusTotal and no malware or virus' in that so I dunno. Considering it cam from a Russian site that has spam when hitting the download link, I dunno if I'd trust it.
EDIT2: When I checked spintiresmod with VirusTotal, I removed the SpintiresModInstall.exe from the zip file to check it. I first checked the zip file but nothing came up. So to be sure, I unzipped it and checked the SpintiresModInstall.exe alone and is when it showed the file had malware.
Also, I'm not trying to condemn spintires mod, just giving ya'll a heads up on what I found out.
@Rohirm, Yeah. I'm not sure what the hold up is with maps on the workshop. I always figured maybe it was a size limit problem or something. I was a little uneasy about that spintires mod like @Tattoo was saying. That's why I decided to create my own and make it open source so anyone (who knows C# at least) can see that it's not sketchy.