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The extension's version 3.4 is compatible with TYPO3 10 LTS and makes use of new features like Symfony Command Controllers.
The simplest way is using Composer on a command line. Just execute
composer require "normanseibert/ldap:^3.4"
in your TYPO3 installation's directory to install the latest version.
Documentation is available online:
https://docs.entios.de/ldap-3.4/
Read documentation
The complete source code and additional releases are available on Github:
https://github.com/nseibert/ldap/tree/ldap_3.4
Open Github repository