Monthly subscription with no internet

Hello!I'm want to set monthly subscription on my product, but the problem is that my customers has poor internet or has not internet connection at all.So what shall I do?1) If I set DaysBetweenChecks for 90 and GracePeriodLength for 30 then after 90 days a customer with no internet will get a message, that he have to reverify licence, even if he has payed this month.So I want to set DaysBetweenChecks for 365 days. Every time program starts I will check the custom licence field, "licence_expired" for example, if it is not valid then application will not start, and customer needs to pay subscription. After he had payed, I'll renew "licence_expired" field and customer will renew field value like in https://wyday.com/limelm/help/license-features/#change-field-read-newIs it right way?

2) In this case (DaysBetweenChecks = 365 days) if I decide to revoke the key - how it will block customers application? Customer needs to re-verify licence manually?

3) What customer needs to do if he decided to change the computer and he has no internet?

You do it exactly the same way as you do with online activations. Namely, follow this article:

https://wyday.com/limelm/help/license-features/#change-datetime

https://wyday.com/limelm/help/license-features/#change-field-read-new

Also, activations themselves use about 4Kb of data. So, even old dialup connections can speedily activate.