If the other two devices have a working SSH connection from developer.weaved.com, then use the instructions provided already to update Weaved over a Weaved SSH connection.
When you run the installer, the daemons will be restarted, but using the nohup command makes sure that the dpkg command continues to run even if the Weaved connection is momentarily lost. Usually, if you are running a command in an SSH window and kill the window or network connection, any processes you launched from that shell also terminate.
Since you seem to already have the RMT service installed, you may need to uninstall ONLY that using the sudo weavedinstaller command. Then, exit the weavedinstaller script and then run it again.
Here's why you need to do that. The weavedinstaller script looks to see if some services are installed but not one configured as RMT3 because this is the most common upgrade case. If there is no RMT3 service, it installs one (after asking you for the "Device Name") and then makes the connection between that and the other services. What you seem to be currently missing is the "HWID" which groups all the services together.
Looks like you may have installed an earlier version of 1.3-07 that might not have had everything it needed. The 1.3-07u is the latest fully tested version and should work OK.
The HWID is kept in the file /etc/weaved/serial.txt.