One cannot just use any version of Google Sceneform Tools (Beta) with any version of Android Studio. As this one comment suggests, even if it's about other versions (also see the other comments there):
A temporary solution: install Android Studio 3.5.1 + Sceneform 1.5, make sfb file, place in project in Android Studio 3.6.
So in your case, you might probably have to update to Android Studio version 3.5.3
or any other version, which works with the current version 1.16.0
, as the Android Studio which you are using appears rather outdated.
If you just want to be able to start Android Studio again, then manually delete the plugin directory from %USERPROFILE%/.AndroidStudio3.2/config/plugins
, in order to perform a manual uninstall, as it might be required in order to update Android Studio.
Besides "it's not working" is not an error description. You'd have to start Android Studio from the command line, in order to get some meaningful error message, by which you then could search in the issues on GitHub (if the reason why it doesn't start up anymore might have another cause).