If you are talking about the Windows task scheduler, it's already included in your OS, no need to install.
From the Microsoft Help:
- Open Task Scheduler by clicking the Start button , clicking Control Panel, clicking System and Security, clickingAdministrative Tools, and then double-clicking Task Scheduler. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
- Click the Action menu, and then click Create Basic Task.
- Type a name for the task and an optional description, and then click Next.
- Do one of the following:
- To select a schedule based on the calendar, click Daily, Weekly, Monthly, or One time, click Next; specify the schedule you want to use, and then click Next.
- To select a schedule based on common recurring events, click When the computer starts or When I log on, and then click Next.
- To select a schedule based on specific events, click When a specific event is logged, click Next; specify the event log and other information using the drop-down lists, and then click Next.
- To schedule a program to start automatically, click Start a program, and then click Next.
- Click Browse to find the program you want to start, and then click Next.
- Click Finish.
If you are talking about the task scheduler withing QV server / publisher, you'll need to license the server / publisher, download the software from QT download site and execute the installer.