For reference...
I was asked by someone if my "(NE) Collapse pinned topics" plugin was compatible with IPS 4.6.x
As it works alongside this plugin, I have tested "(NB40) Separate Pinned Topics" with IPS 4.6.x and can confirm that it does work as expected. However, there is the caveat that you must have "(NB40) Separate Pinned Topics" installed prior to upgrading to IPS 4.6.x as the plugin cannot be installed new on IPS 4.6.x as it is not currently marked as compatible.