How Do I Fix “Error 1500 – Another Installation Is in Progress”? Let’s now go ahead and look at the fixes for the error. In this case, the problem is suspected to be caused by an ‘In progress’ key left behind by a previous installation. Normally, as the message points out, all you need to do is check if there are any ongoing processes and then wait for them to complete or terminate them.īut many Windows 10 users report that they get the error even when there are no other actions in progress. “Another installation is in progress” with the error code 1500 occurs when you try to start a program installation at a time when Windows Installer (MSI) is already running. “Why does this happen? And what can I do to get rid of it?” You’ll get the answers to these questions soon enough. It has been encountered by users on previous versions of Windows, including Vista, XP, Windows 7, and Windows 8. This leaves you to wonder where the error is coming from. What makes the issue so frustrating is that there’s no other ongoing installation. This could also happen during the download process. You must complete that installation before continuing this one”. Instead, you keep getting an error message that says, “ Error 1500. You’ve downloaded a program on your Windows 10 computer, but it refuses to install.

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