Installation in a temp directory

[AlexanderSkrock]

Is your feature request related to a problem? Please describe.

In case you just need a one-time use modeler or quickly want to test something in another version, you might not want to loose your current installation.

Describe the solution you'd like

We should add an option to use a random temp directory as installation path.

Describe alternatives you've considered

Alternatively, you could change the configuration or overwrite on command level but still this would be a lot of overhead. Defining a different path and not forget to clean up.