panzerkroete

hello guys, i bought OA at gamestop. the problem is that i dont have a cd drive in my gaming-pc so i installed it via LAN from my laptop. i thought that i can choose between Online-activation and DVD authorization during the installation process, but i cant. is there any way to download an activation-tool so i can finally play it? or is there any (legal) download of OA with the option to choose the way of activation? thx alot