If it is, make sure Logic is closed, remove the plugin manually and install it again.
If you still can't see the plugin in Logic, browse to this folder and check that the plugin is installed there (in Finder, press SHIFT-CMD-G and enter a folder name in the dialog to open it directly):
If the plugin also doesn't appear on stereo tracks, open Logic's Preferences > Plug-in Manager and check that the plugin is listed and activated. In Logic, a newly created audio track is mono by default. Some of our plugins only work on stereo tracks. If the plugin in question is Kickstart, be aware that it appears in the Nicky Romero folder in Logic's Audio FX menu, not the Cableguys folder. Some DAWs (including Ableton Live and Logic Pro X) may not recognise the plugin otherwise. Please restart your Mac after installation.