The icon on your avatar means that you bought your license on the website.
As such, you can download your license back from the store's "Your downloads" page.
Then you can refer to this manual article to install your license again.
If you have further issue, send an email to Scirra's support indicating possibly your Scirra reference number for your purchase (written in the email where you got your redeem code for your email) and your username.