There is no difference between the installers of mIRC v7.38 and mIRC v7.41. If you run the mIRC installer and it shuts down with no error messages, this usually indicates that another application has forcefully closed it down. The most common cause of this issue is anti-virus/security software. Note that some anti-virus/security software continues to run in the background in some way, even if you disable it. You will need to make sure that you have shut it down completely and/or contact the anti-virus company for help with their software.
