You will be sent a redeem code by email. Go to Redeem Codes to redeem it.
Then go to Your Downloads at the Scirra store to download the license.
More info can be found here to install it...
[quote:274no9fh]Once you have redeemed your purchase from the Scirra Store, you can download your Construct 2 license, which is a file called c2license.txt. You simply need to copy this folder in to either the install directory or My Documents. Restart Construct 2 and it should launch as the licensed version: the purchaser name should appear on the start page and About dialog, Free edition should disappear from the title bar, and the free edition limits should be removed. Alternatively, you can place your license file wherever you like and locate it by clicking Load license file in the About dialog.