If, when selecting your desired plan (monthly or annual), the prices do not appear or you see an "X", and tapping "Continue" does not start the purchase process, it is likely due to the regional settings of your account in the App Market (Google Play or App Store).
This issue occurs when your App Market account is associated with a country where the subscription model is not available. Please contact us at
support.duoxme@fermax.com and let us know which country you have configured so that we can take your comment into account and consider expanding the availability of countries.