Use something like VMWare Workstation, spin up a Win7 VM, pass thru the Sonnet device to the VM & do the captures there?
What machine did you use previously? There is nothing PhaseOne can do if Microsoft decides to pull out the underlying tech. The folks who have it working sound to be upgrades, rather than new installs.
Depending on how far down the setup of the new laptop you are, can you 'downgrade' to Windows 10 long enough to get FW working, then upgrade? The downgrade would involve doing a reinstall & erasing everything, and drivers will be an issue - check the Asus site to see if they have Win10 drivers before going too far.