# Installation and Upgrade

This section describes how to install or upgrade the Run-time Environment.

NOTE Given the following circumstances:

>You are installing or upgrading the Run-time Environment on the customer's machine.

> You want a placeholder for new SL keys for the relevant Batch Code to appear at the top of the Sentinel Keys page in Admin Control Center.

Distribute your current custom Vendor library along with the Run-time Environment installer.

## Installing the Run-time Environment

>The Installer GUI detects the version of the operating system during Run-time Environment installation, before installing the relevant drivers.

>By default, Windows displays a User Account Control message during driver installation. The user must click Continue to continue the installation. Alternatively, the user can change the default setting from the Control Panel of their operating system.

>A log file of the installation process is written to aksdrvsetup.log in the Windows directory.

## Upgrading the Run-time Environment

When using the Installer GUI to upgrade the Run-time Environment, ensure that:

>No other Run-time Environment Installer is active.

>No other Run-time Environment components are active. Although the installation program terminates applications that are accessing the Run-time, it does not terminate running services. For example, if the Sentinel License Manager is running as a service, you must stop the service before upgrading the Run-time Environment.