To install this skript, first go to https://github.com/SkriptLang/Skript/releases/download/dev37c/Skript.jar and then place the skript in plugins/Skript/skripts (it is inside the skripts folder inside the skript folder in the plugins folder)
Then make sure it is enabled and loaded (/skript reload all) or (/skript enable Event_Variable_CORE)
If typing "/e" and nothing pops up relating to the skript, then please PM me or create an issue at https://github.com/Techno3600/Event-Variable-Toggle-Skript/issues. Thanks!