On 06/02/2021 08:35, Daniel wrote:
... >
And tonight I've booted up into my Win7 SM 2.53.5.1 .... and no Lightning/Calendar there either!

No version of the Lightning extension listed for Thunderbird is suitable for SM 2.53 because the new versions use WebExtensions while the version 5.4 that you need is limited to SM 2.49.x. The Add-on Converter could change that, but you ought to be using the version distributed with the program.

In the Release Notes <https://www.seamonkey-project.org/releases/seamonkey2.53.6/>:

-       Lightning or one of the distributed extensions is not showing up or is 
disabled under Add-ons.
If the extension is disabled and can not be enabled deinstall it. If it does 
not show up after restart do the following:

    Enter "about:config" in the location bar.
    Enter "extensions.installedDistroAddon" in the search field.
    Reset the key of the extension not showing up using the popup menu with the 
mouse. If in doubt just reset all keys, but this might bring back previously 
uninstalled distributed Add-ons.
    Restart SeaMonkey.

This causes the extensions distributed with the program to be [re-]installed. In Debian-style Linux they're here:

$ ls -l /opt/seamonkey/distribution/extensions
total 2012
-rw-r--r-- 1 root root 399843 Jan 17 16:53 {59c81df5-4b7a-477b-912d-4e0fdf64e5f2}.xpi -rw-r--r-- 1 root root 1305192 Jan 17 16:53 {e2fda1a4-762b-4020-b5ad-a41df1933103}.xpi
-rw-r--r-- 1 root root  351730 Jan 17 16:53 inspec...@mozilla.org.xpi

The Lightning extension is the file
"{e2fda1a4-762b-4020-b5ad-a41df1933103}.xpi"

I expect that that there is a directory branch "distributions\extensions" under the SeaMonkey program directory in Windows.

/df

--
London
UK
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