Installation 

Install with Composer 

Install the extension via Composer:

Terminal 
composer req lia/lia_imageserver
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See also Installing extensions, TYPO3 Getting started.

Install in Classic Mode 

Download the extension from the TYPO3 Extension Repository at https://extensions.typo3.org/extension/lia_imageserver and install it in the Extension Manager.

Include the TypoScript 

Include the static template LIA Imageserver in your site template (Site Management > TypoScript, tab Advanced Options). It provides the constant for the responsive image template path, see Override the responsive image template.