With the changes MaxMind have implemented it is now a requirement that anyone using their lists must have an account and by having that account will have accepted their data protection requirements. It's fairly simple to set-up so let's get started.
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Create An Account
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Goto https://www.maxmind.com/en/geolite2/signup and create your account. Note that the email address you provide will be used to send you the link you will need to enter in OPNsense, so make sure its a real account.
Once you have created an account you'll need to create a license key. Click in the "My License Key" link and generate a key. Save the key ID somewhere safe!!!
Now we need to create the link we'll need in OPNsense, all you need to do now is to replace the 'My License key' part of the link below with your license key.