* How do you determine that prerequisites are met before allowing the packages to install?

* How do you stop the installation if conditions are not met?

Looking for an improved experience through the Installation Wizard. Obviously all of this could be checked by something like SPE.

### Update

Would the use of the event `packageinstall:starting` be a good option? Perhaps make SPE run a script on this and then bail out of the installation when certain conditions are not met.