You can always check your membership status in PLAN USAGE window (1.):

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As you can see, expiry dates are visible in the title bar as well (2.).

When your access is close to expiry date (or has already expired), you will get notified in the title bar.

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To extend your access, please click “EXTEND NOW!” button in the title bar, or “EXTEND ACCESS” button in “PLAN USAGE” window.

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Now, press “BUY NOW” to purchase an extension code. Your browser will direct You to the order form, where you can choose if you want to extend both UPDATES and PREMIUM data access (recommended) or UPDATES only and select extension period.

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After processing the payment, you will receive the extension code – please put it in “Extend membership” window.

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That is all. From now, you can enjoy your extended access!