Download Windows Installer 4.5 redistributable. The following file is available for download from the Microsoft Download Center: [Asset 4009805]Download Windows Installer 4.5 now. Note Check the following table to find which file to choose for your operating system：

If the Windows Installer engine is corrupted, disabled, or installed incorrectly, this may cause program installation issues. Use the following methods to identify any Windows Installer issues that may be causing problems when you install, uninstall, or update programs.

Click-to-Run is the technology used to install Microsoft 365 subscription and most versions of Office 2013 and newer. Windows Installer technology (MSI) was used to install the volume license editions of older versions of Office 2016 and older, such as Microsoft Office Professional Plus and Microsoft Office Standard.

To create installation media, go to the software download website, where you'll find step-by-step instructions. On that website, you can select a version of Windows and create your own installation media using either a USB flash drive or a DVD. To go directly to one of the versions, select one of these links: Windows 10 (Then select Download now.)

After you upgrade to Windows Installer version 2.0, the Windows Installer Service may not start, and you may receive the following error message: The Windows Installer Service could not be accessed. This can occur if you are running Windows in safe mode, or the Windows Installer is not correctly installed.

315346 Error message when you try to add or remove a program on a computer that is running Windows XP or Windows Server 2003: "The Windows Installer service could not be accessed". Resolves an issue in which you cannot install a program in Windows 7 or Windows Vista.

To upgrade to Windows 11, you need enough space on your hard drive for the installation to take place. To view how much hard drive space is available on your computer, select File Explorer on the taskbar (known as Windows Explorer in Windows 7) or press Windows logo key + E. Then select Computer or This PC and look under Hard Disk Drives or under Devices and drives.

Summary. This article lists the hotfixes that are currently available for users who use Windows Installer 4.5 and Windows Installer 5.0. Windows Installer 4.5 is integrated in Windows Vista Service Pack 2 (SP2) and Windows Server 2008 SP2. The redistributable package is also available for the following operating systems: