Hi @Arruda
The documentation on using Let's Encrypt with Filemage seems to be here at
However, there was an issue where many certificates were revoked early in January of this year:
There is not yet a widely-supported way that Let's Encrypt users' software can find out about this kind of unusual situation automatically. 
Although hopefully there will be in the future (that's a separate discussion).
Therefore, many users have had to manually initiate early renewals in their software. While there are instructions on this forum for how to do that with many kinds of software, it seems that Filemage is unusual enough that nobody has researched or described the process here yet.
Since the Filemage documentation on their site also does not make clear how to do this, I would suggest writing to the Filemage creators via the e-mail address listed at
You can point them to the thread above and let them know that you need to trigger an early certificate renewal due to an unexpected certificate revocation by the CA. Hopefully they can give you straightforward instructions, and, if you wouldn't mind, you could post them back here to help other people who might be in the same situation.