This is a USER TO USER forum, not Adobe support... so your case# will have to be used by you in a telephone call to Adobe
If the option is not active in your install, only Adobe will be able to deactivate, from their end
Unless PrE 8 added Activation, Elements has never needed to be Activated. Which version of Premiere do you have? If you have PrPro, you are in the wrong forum, but for that program, one would go to Help>Activate/Deactivate (about the 4th line down).