ClanHost have made changing Maps very simple.
On your Service Page click "Command Line Editor"
In CUSTPARAM2 add the name of the map. For example
TheCenter
ScorchedEarth_P
Aberration_P
Extinction
Valguero_P
Save and restart your server.
Extinction
Please not we tried updating the server and running Extinction however this failed bad. What worked for us is this....
1. Disable all mods in mod manager.
2. Remove any set clusters.
3. Run a fresh install (Don't forget to backup and download your old save if you wish to use it)
4. Shutdown the server.
5. Add Extinction to CUSTPARAM2 in the command line editor.
6. Start your server.
Ragnarok Map
You need to wait about 10 minutes for the server to download the DLC. Keep an eye on your ram, should jump from 300mb to 1,500mb back down and back up again.
If you still have issues, remove your mods from commandline CUSTPARAM1 and try again.
Ragnarok should be in your CUSTPARAM2
For Custom Maps (CrystalIsles)
You will need to upload the map from your computer to the server.
On your computer copy the folder C:\Program Files (x86)\Steam\steamapps\common\ARK\ShooterGame\Content\Mods\804312798\
to
\ShooterGame\Content\Mods\ folder on the server
And the file
C:\Program Files (x86)\Steam\steamapps\common\ARK\ShooterGame\Content\Mods\804312798.mod
\ShooterGame\Content\Mods\ folder on the server
Crystalisles should be in your CUSTPARAM2