Recently updated to check the beta version of Thunderbird (Version 43 ? ) and lightning is no longer available. Is there a version coming to support that?
How are you getting the TB Beta? It should be version 60.
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Current ‘release’ channel is on v52. Lightning is now fully integrated in Thunderbird Beta (v60). This means you no longer need a separate add-on to fulfil your calendar needs. 60 is also due to roll to the release channel in a matter of days.