Your files
Test purchase. Short lifetimes: this page 15 minutes, each link 5 minutes.
Save your key now. It is shown only once. It is the password to this purchase: with it you can come back after this page expires, get new sheets and renew. Programs use it too.
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Open your files with your key
Enter the key you saved after paying. Use it when your order page has expired, when new sheets are out, or after you renew.