I have most of my vsts installed to C:\Program Files\VST and point FL studio to it. You can have multiple VST locations set in FL Studio but I like to have mine in one place.
Feel free to connect if you need any testing I'm happy to help!
Not manually disabling. After running the installer and refreshing plugins Nimble Kick did not show up in my list of available plugins.
There was no uninstall function in the installer and windows "add and remove programs" did not see it so I placed the non installer version in my "C:\Program Files\VST" folder and after refreshing plug ins I was able to load Nimble Kick.
If you'd like I can try removing the NibleKick.vst from "C:\Program Files\Common Files\VST3" and removing the non installer version I put in "C:\Program Files\VST" and trying again from scratch to see if I can replicate it.