The default location for qvf files is C:\Users\<username>\Documents\Qlik\Sense\Apps. If you place the file in here and then restart Qlik Sense it should be visible in the Qlik Sense hub. I do note that you have appear to have changed this in your settings.ini and so c:\temp is probably okay.
As long as you can see the model in the Qlik Sense hub you have two options, you can double-click to open the file or you can open the file without any data. If the normal process still fails then I would suggest trying to open the document without any data and then see if you can diagnose the issue.
To open a file without any data right-click on the model in the Qlik Sense hub and select "Open without data".
It may also be worth ensuring you are using the latest version of Qlik Sense which is 2.0.1.