Press the unsubscribe button, then the uninstall one. Once you have done that, go to your Garry's Mod directory, and look for the "Smartmovebeta.gma" or something like that. It should say "smartSOMETHING.gma", and delete it. And that's it.

Thanks for the quick response

also that way is with every addon, i dunno why, must be a glitch/bug, that is garrys fault... i think

Or just unsub and go off and on gmod