Dude, this key doesn't work. To get a working key, follow these steps:
1. On the menu, select Publish/Download Projects, then choose Upload.
2. Once you upload it, choose Publish Project that Allows Secondary Use. Choose your file.
3. Once completed, wait about a minute, then click Download. If you see an orange colored set of numbers next to the game, thats your key!
What LegoMaster said. Your "524416" is just file size in bytes. A key is in big orange font and has numbers and letters (in geek speak, alphanumeric characters), see screenshot.
