Monolingual

This is an update to my original posting. I'm continuing to have the same problem with 1.7.2. It does not run on my machine and I am forced to continue to download and use 1.6.7. The program boots, but will not run. Immediately after I enter my password to grant administrator authority to the program a screen pops up indicating that it "Failed to install helper utility". I have removed and reinstalled the program seven times. Each time I remove it using the App Cleaner program and reloaded it by downloading a fresh copy of the file from the website //ingmarstein.github.io/Monolingual/ . I love the program and it's ease of use, but I would like to make it functional again. It started having this problem as soon as I upgraded from 10.10.4 to 10.10.5 and it remains a problem now that I have El Capitan installed. Are there any suggestions how to fix this so that I can upgrade to the latest version?