check "Troubleshooting / Modding info" discussion thread for info on how to setup a server with this map, there's a section for server owenrrs

1. Download Unturned Dedicated Server from steam
2. Find the folder for U3DS and look for unturned.exe
3. Create shortcut and rename it as Elver (it will be easier to identify which files belong to it if you plan to create more DS maps)
4. Right click aforementioned shortcut > properties > copy and paste following line in target box, make sure spacebar at the start of this line:
-nographics -batchmode +lanserver/Elver
5. Apply and run your server. After it says 100% level loading close it with "shutdown" command
6. Go back to your U3DS folder, open subfolder Servers and Elver
7. In "WorkshopDownloadConfig" copy and paste this number inside square brackets in File_IDs:
2136497468
It enables your server to download and run Elver's assets since they aren't in Unturned files by default
8. In another subfolder Server open "commands" and enter:
map Elver
(remember about other commands such as "maxplayers", "password", etc, but "map" is the most important)
9. Everything should be ready. After running your DS in command prompt "successfully set map to Elver" should pop up shortly after booting and whole server should load.

Hope I made it clear. Feel free to ask if there's something you don't understand in this guide.