This will show you all the running processes & applications that are on your system, where you should be able to look through and remove the various versions of Windows Installer that might be operating. You first need to ensure that only one instance of Windows Installer is running, which can be done by pressing CTRL + ALT + DEL on your keyboard to load up the Task Manager. The way to resolve Error 1618 is quite simple. Windows Installer can open from the likes of having automatic updates installed on your system or from a previous install that did not occur.

Each time you want to install a program on your PC, certain important processes are used that only one installer can utilize at a time meaning that if you have more than one instance of Windows Installer open, it’s not going to work. The problem that causes the error is all down to how Windows works. Complete that installation before proceeding with this install.

Error 1618: Another installation is already in progress.

This error will generally show in these two variations: It can cause all sorts of problems, from not allowing you to install the program you want but fortunately – it’s straightforward to fix if you’re able to follow the various steps which will resolve the errors which cause it.

The error is basically caused by the presence of a more-than-one Windows Installer program, making it impossible for your computer to run at least one of the installers. The 1618 error generally shows when you try and install a program on a Windows computer using the “Windows Installer” application.

Dmlss error code 1618