Hello, it is possible to work without an internet connection. Spine requires a connection to our servers when you first install the Spine Launcher so that it may download the version of Spine that you would like to work in. After that, it should be possible to work offline.

If you're seeing that message pop up repeatedly, could you reinstall Spine with the latest launcher from your License Page?
And if that does not fix the issue, please reply to this forum post with your Spine log file, which can be found here: Spine Troubleshooting: spine.log

Luke missed that you are using a floating license, which does require an internet connection. That is the trade off for being able to share the license. Unfortunately the 5 minute interval is not configurable. We could consider increasing it a little, but I wonder how much it would really help? If you lose contact with your ISP for 5 minutes you may also lose contact for 7 or 10 minutes and would have the same problem.

Ah, that's not good. It sounds like the floating license is not a good fit for your company in that case. If you'd like to switch from floating license to per seat licensing, please have your administrator email us: contact@esotericsoftware.com