For more information please visit https://www.janolaw.de/agb-service/einbindung-typo3.html
The recommended way to install the extension is by using Composer. In your Composer based TYPO3 project root, just do
composer require typo3-ter/janolawservice
or
composer require janolaw/janolawservice
Download and install the extension with the extension manager module.
If you update from an older Version (3.x) to Version 4 the upgrade wizard ‘Migrates janolawserive Plugin’ must be executed, the database structure may be updated and the caches must be deleted!
If you update from an older Version (0.x oder 1.x) to Version 2 an update of the database structure is needed.