Hi,
I got the same issue on the 2016 version too.
So after trying to figure it out, I ended by installing the last version of LibFredo6 (v11.6a). On restart sketchup complains about this bad version, I then reinstall the prior 2017 version of lib (v9.5k). On next restart, everything runs well (at least TopoShaper which I can now use).
Not sure what happens exactely (maybe a missing file in v9.5k of bad folder naming during install), but hope this can help!