If using Internet Explorer or Edge there will be a "security" check after the download is done to verify it's not a malicious file. Unfortunately, Cubit Estimating will be detected as malicious and Edge/IE will 'block' the file.
There should be a prompt as this is downloading letting you know it was picked up as malicious. If you missed this prompt for some reason, Edge would cancel the download. (see example below)
As a recommended workaround, use Firefox or Chrome to complete Cubit Estimating Download. IE/Edge will give you an option to allow the download but you will need to keep an eye out for the 'allow' option.