A function added by the New Vegas Script Extender.
Returns true (1) if the specified NVSE plugin is loaded. Note that plugin names are set during registration and displayed in the file, nvse.log, it is not the file name. Added by NVSE 4.5.
(bool) IsPluginInstalled PluginName:string
if IsPluginInstalled "MCM Extensions" ; MCM ... if IsPluginInstalled "Extensions for NVSE" ; NX ... if IsPluginInstalled "lutana_nvse" ; Lutana ... if IsPluginInstalled "JIP NVSE Plugin" ; Jazzisparis