NOTE: This only affects players using the JNLP client, not the regular default launcher.
The JNLP Client has moved to https://client.wurmonline.com/client/wurmclient.jnlp. The download page has been updated as well. We are removing the files from the old location and this will likely break older JNLP installs. You will need to uninstall the client and reinstall from the new location to continue using the JNLP client. Please note that uninstalling the client leaves your 'wurm' folder intact and will not remove your settings.
To uninstall, run the command javaws -viewer, select Wurm Online from the list and click the X for Remove Selected Item.