Update installer dialog buttons do not work

[sunergeo]

My Setup

• Operating System: MacOS High Sierra 10.13.6
• App Version:2.15.0
• Installation type: dmg

• I have tested with the latest version
• I can simulate the issue easily

Description

The buttons on the update installer window do not work, preventing me from applying the latest update.

Current Behavior

I am prompted by the update checker with a window asking if I want to update. The only response button that does anything is the "Skip This Version" button

Expected Behavior

All buttons should work

[tassoevan]

Duplicate of #1141. The workaround is to manually download and install the newest version.