With all the new updates now when i play i can no longer play dayz offline anymore and none of these files helps anymore either! I'm not sure what they did but offline single player dayz don't seem to work at all for me or my friends anymore. I wish you the best of luck But ive run out of ideas on how to get the game to play offline.

I figured it out after a while & got it working. I followed a video on YouTube by user KillBeanz. But after you download the mods needed, they don't go to a !Workshop folder.

When you go into the Mod section of the launcher and you have to find the files. They're now stored in C:/Local Disk/Program Files (x86)/Steam/steamapps/workshop/content
The files are all numbered & don't show the names, but select each folder of the Mods you want & they'll load into the launcher.

I added Community Framework, Community Online Tools, DayZ-Expansion, DayZ-Expansion-Core, DayZ-Expansion-Licenced & DayZ-Expansion-Vehicles.
In Parameters I added the map location I wanted to play under Mission & made sure the box was ticked & pressed Play at the bottom & it booted just fine.

Ok it's a bit buggy. Crashes occasionally. But the Mods all work. Spawn any vehicles & weapons in. But there's no loot or Zombies. All of that you have to spawn in yourself.
If you get a chance to try again, that's how I got it to finally work.

Thank you, sir. Was totally confused by the lack of those files in the !Workshop folder