Do not pay for it individually, technically you already have it, you should see this message on the page.
If the problem persists and the message does not appear, you will need to do what I instructed you in the previous comment, which is to go to the “I already paid for this” section and follow the instructions.
If the issue continues, you will need to contact the website support. There is nothing more I can do, I hope the issue gets resolved soon.
