My initial thoughts are not to upgrade your Macs to Sierra until someone knowns that it will continue to work. You don’t HAVE to upgrade the OS on your Macs, you know 
Another strategy would be to create a virtual machine (using VirtualBox - https://www.virtualbox.org - or similar) with Freeway on it, and keep that for any web work if moving to a new version of macOS is vital for other activities you have.
Freeway will continue to work if you have a machine that it will work on. It just won”t get any new updates, bug fixes, etc… So your short to mid-term use of the application is assured if you adopted a preservation strategy.
You will need to start considering what application to move to in your post-Freeway future, and transition projects to that.
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