1. Do I need to be an experienced Delphi Programmer?
No, you can use LizaJet Installer without doing any programming at all.  Just fill in the parameters and build the installation files.  The ‘do not need to program’ capabilities of LizaJet Installer even go beyond other tools that are sold as ‘no programming required’.
But when you really need to do something special you will feel save in knowing that under the hood the Object Pascal Script Engine is silently waiting for your commands.

2. Wich version of Delphi do I need?
No one, you do not need Delphi at all, LizaJet Installer is self contained. 

3. Which part of Object Pascal did you implement in the Script?
We have made a nearly complete implementation of the language, including classes and inheritance.  The Object Pascal Implementation (PDF) guide gives a complete overview of what is implemented.