This add-on is for players that want to experience the fully enhanced mechanics of GMDX hardcore without the restrictive save point system.
To install extract the contents of HardcoreQoL.7z to %\Deus Ex. The result should be a new set of folders %\DeusEx\HardcoreQoL\System with one file inside, DeusEx.u.
To activate the mod using the Give Me Deus Ex shortcut on the launcher select "Data Directories." Make sure the box next to "HardcoreQoL" is checked and move it above GMDXv9 in the list. See example below: