Run don't walk to this tip on how to add an Install as Admin for MSI's

How-to Geek - How to Force an MSI Package to Install Using Administrator Mode

When you need to install a program as an administrator, you can right-click on the .exe file and select Run as administrator. However, that option isn’t available for MSI packages. We will show you how to add an Install as administrator option for MSI packages.

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No need to remember the misexec steps once you apply this reg hack...