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No cost, just download and install.
Pro Easy to learn
The (generated) script can be run in Inno Setup and it is possible to set breakpoints to debug the code.
Pro Pascal scripting engine
Integrated Pascal scripting engine option for advanced run-time install and uninstall customization.
For programmers used to C and C#, the Pascal scripting syntax is something that takes a while to get used to.
Con On uninstall does not check file content
If the file content has been changed after installation, the file is uninstalled without warning the user.