Update for anyone using this. The current plugin (v1.0.18) is designed to remove itself if you upgrade to 4.9.x firmware. This was intentional as GL was making significant changes to the GL TS implementation in this firmware version and we didn’t want potential conflicts.
Unfortunately, initial testing with 4.9 firmware has shown that using it as a “VPN” (connected to an exit node) is just as exposed to IP leaks as the prior firmware. There was no improvements in the 4.9 implementation for a killswitch, guest routing, or the “TS Tiny” binary from @admon for increased performance and efficiency.
If you are using TS on a travel router for remote work purposes, you may want to consider downgrading to 4.8.x and re-installing the plugin. We are working on an update to close the 4.9.x firmware gaps without creating conficts with the newly added GL “exit node” or “IP masq” functions that overlap with the same functions in the plugin.