TYPO3 12.4 and 13.4 

Version 0.9.x (branch typo3-12-13) supports TYPO3 12.4 LTS and 13.4 LTS. For TYPO3 14.3 use version 1.x. All endpoints, page fields and the EXT:news support work the same as in 1.x. The differences are in the setup only.

Tested on fresh installations of TYPO3 12.4.45 and 13.4.36, each with two languages and EXT:news (13.0.2 on TYPO3 12, 14.1.2 on TYPO3 13).

TYPO3 13.4 

Same as TYPO3 14: add the site set in Site Management > Sites, field Sets for this Site, see Installation. The settings can be edited in Site Management > Settings or in config/sites/<identifier>/settings.yaml.

TYPO3 12.4 

TYPO3 12 has no site sets. The field Sets for this Site and the module Site Management > Settings do not exist.

Activate the extension for a site 

Add the entry by hand to the site configuration. The backend keeps it when the site is saved in Site Management > Sites.

config/sites/<identifier>/config.yaml
dependencies:
  - woit/si-llms-txt
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Settings 

Put the settings (see Configuration) into the site's settings.yaml. Without the file the defaults apply.

config/sites/<identifier>/settings.yaml
sillmstxt:
  articleDoktypes: '12'
  news:
    detailPid: 42
    storagePids: '43'
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The values are not validated, as TYPO3 12 does not read the setting definitions of the site set. Check the spelling of the keys.