You cannot run the two instances of the same program to install or uninstall it. And if you click it again you will get the error. Whenever you click the downloaded setup file then it should open but sometimes it may be preparing to launch in the background. How To Fix Couldn’t Start Office Installation – Error 0- 1018 (0) In this article, you will find different ways to fix this issue. But if it has downloaded and copied some files to the drive then it will interrupt the installation.

If the setup does not launch for the first time then wait for a few minutes to open it again. But if you click in the setup more than one time it will show the error that another installation is in progress. The installer will download the whole program. If you download and install MS Office 2019, Microsoft 365, or any version of Microsoft Office then it will download its installer. We’re sorry but we could not start your Office installation. This is a very common issue with Microsoft office that whenever you try to install Office it throws an error “ Couldn’t Start Office Installation.