When Suhosin extension is loaded, system temporary directory needs to be available

First of all, create a temporary folder with all permissions (777) on your server, It can be placed in the LiveAgent folder,
e.g. [your_LiveAgent_folder]/install/TEMP/ .
Go to /include/Gpf/Templates/ in your Live Agent folder and edit file Smarty.class.php
Find the following string
private static function getSysTempDir() {
 
and add a new line after that one - it must contain a relative path to your temporary folder. This path is relative to the  install/  folder
return './TEMP/';
 
save the file and run the installation. Skip the integrity check when you get: include/Gpf/Templates/Smarty.class.php  CORRUPTED

In order to skip the integrity check use the p=F  parameter: 
https://yourserver.com/LiveAgentFolder/install/index.php?p=F
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