Make sure you are using the latest version of WordPress and at least PHP Version 7.4 (preferably 8+). Using versions of PHP older than 8 is not recommended due to security and performance issues in old versions of PHP.
Download the plugin file from CodeCanyon Downloads page by clicking the green “Download” button and selecting “All Files & Documentation” option. Once you downloaded the .zip archive, unpack it and inside you will find a folder called latepoint-all-files, open it and use latepoint.zip file to install the plugin.
Now go to your WordPress admin and upload this latepoint.zip file to your plugins page in admin.
Don’t forget to activate it. Once it’s activated you will be presented with a Setup Wizard, that will guide you through setup process like adding agents, services and setting work hours.