When trying to open any .erwin file by double clicking it, the erwin installation starts. Do you know why?
If launching an .erwin or any other file also starts the installation process of erwin, then either erwin or the other application or both not installed with full admin rights. When the other file is launched, and it has reference to erwin, it searches for erwin install. When it cannot find it, it tries to install it.
If it worked before and the problem occurred recently, then this could be because of upgrading OS from Window 7 to Window 10 and some privileges may have changed. If upgraded to Windows 10, then try to start as an Administrator to see if it is still a problem.
if it does not help even when launching erwin using 'Run as Administrator', then try to use with Windows 7 compatibility mode.
Or reinstall erwin DM with full admin privileges.