According I see, the Debian Jessie package has the version 1.8.2 for
Enigmail:
root@orion:~# aptitude show enigmail | grep Versión
Versión: 2:1.8.2-4~deb8u1
But this version does not seem to be compatible with Thunderbird 52 [1].
Enigmail 1.8.2 is compatible with Thunderbird 29.0 to 46.0. That's why
it was running on the previous packaged version of Thunderbird 45.x.