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If you take the 1 year subscription you will be charged the given amount of money once per year until you cancel the subscription. If you quit (cancel your subscription) after 6 months, you will still have active PRO features for the rest 6 months. If you need exactly 6 months, consider the 1 month subscription. In this case you will be charged the given amount of money once per month.
Take monthly subscription
Thank you very much for explaining. I didn‘t get the concept right because they mentioned that I can quit at any time. And why should I quit if I have the Abo for 1 year. So I got mislead into thinking they might mean sth else.