I'm trying to set up a new Macbook Pro. I went to the AppStore to try to reinstall the App I had installed on my old Macbook Pro. Surprisingly, it seems like it's been there unchanged for the last 2 years. But, I install it, and it starts Ok. I like the fact that it seems to support TouchID. But, when it goes to install the Safari extension, it appears to launch Safari with a URL referring to `https://safari-extensions.apple.com/`. However, Safari says "Http/1.1 Service Unavailable".
I called support to "just get it installed", and they gave me a link to install an App not through the App Store. Which worked, but somewhere in the process I had two different Apps called Last Pass installed.
What is the correct way to install the Last Pass App and get Safari extensions working?