Lightning is not included or installable in Thunderbird 54
As of the update yesterday, Lightning disappeared from Thunderbird. I am on the beta update channel. Further, trying to manually install it fails with an unsupported version message.
Solution choisie
I have Lightning 5.6a2 running on TB 54.0a2 (Earlybird), which is not the same as TB 54.0b2 (Beta), which may account for the error. You probably want Lightning 5.6b2, available here. I understand the Earlybird channel will be retired soon, leaving the release, beta and nightly channels.
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Lightning 5.6 is compatible with TB 54. You can find it here.
https://developer.mozilla.org/en-US/docs/Mozilla/Calendar/Calendar_Versions
Still getting 'Lightning could not be installed because it is not compatible with Thunderbird 54.0.' Addons -> Gear -> Install add-on from file -> lightning-5.6a2.en-US.win32.xpi
Solution choisie
I have Lightning 5.6a2 running on TB 54.0a2 (Earlybird), which is not the same as TB 54.0b2 (Beta), which may account for the error. You probably want Lightning 5.6b2, available here. I understand the Earlybird channel will be retired soon, leaving the release, beta and nightly channels.
Thank you very much, that worked!