Unable to install Icedragon 49

Every time I try to install Icedragon 49 from 48.0.0.2 I get errors. This happens whether I do it from upgrade: help>about>check for updates or from a clean install after uninstalling it. It has been happening for months now and I didn’t write anything hoping it would be fixed. A few months ago I alerted a tech support about it in online chat but apparently they never passed it on. When will the installer be fixed?