I'm having a heck of a time with the terminals for demo accounts on MT4.
I am trying to run two terminals for the same broker on the same PC simultaneously, with different account numbers etc. This works fine on W7, but on W8 or greater as soon as I log into the SECOND terminal when the first terminal has been launched and is running, the first terminal gets logged off, and ALL files get deleted. I can't tell you how frustrating this is.
During install I've put installed the files to different folders, even to My Documents, installed to different programs groups, and tried opening and running the shortcut as an administrator.. I've experienced this exact problem on W8, W10 and on my VPS running Windows Server 2008 R2 Enterprise.