But even on the .29 install using the download arrow the install screen also never said installed completed, just had wheel spinning after completing download but never completed install.
You need to shutdown HomeGenie at the Terminal by typing sudo systemctrl stop homegenie.service
Next change folder to your homegenie folder and type sudo mono HomeGenie.exe
This will launch homegenie in debug mode so you can see exactly what is happening
Open you browser and access the homegenie Api. Now try the update and watch what is happening in the putty window. It will show you exactly what the problem is.