September 12th, 2017 - We have returned from hurricane Irma evacuations. We were unharmed and only minor damage to our area. We're working to catch up on support as quickly as possible. Thanks for your support and patience.
You don't need to. You just need to install the main com_jlinked...zip file as if you were installing for the first time.
Doesn't hurt to uninstall first. Either way, all of your settings will be retained. It should be a pretty smooth upgrade process, but if you run into any issues, just let us know.