My 2016 version suddenly stopped working a couple of days ago, and will not re-load .Using Windows 8.1  Downloaded the 2017 version, and it has the same error in installing - It needs a .msi file that does not seem to exist. The only .msi file I can find is from the 2012 version, and that is no good for the later versions. The 2012 draftsight installs OK, but cannot read more recent drawing files. Where can I find the required .msi file?