the new version did seem to install and slickedit itself launches. But vsdiff from the command prompt has regressed, I get this error
Pro15 data:vsdiff Badnell_DR_17.txt badnell_dr.dat
Pro15 data:2018-01-17 15:33:27.697 vs[93595:23155721] modalSession has been exited prematurely - check for a reentrant call to endModalSession:
Then nothing else. No window launches.
I had set the path to the app in .bashrc, so
Pro15 data:which vsdiff
/Applications/SlickEditPro2017.app/Contents/MacOS/vsdiff
The OS is a fully patched current macOS running on a MacBook Pro mid 2015.