ISTool helps you create scripts for Inno Setup compiler. ISTool helps you create scripts for Inno Setup compiler. Inno Setup is a great compiler for very professional looking setups, and the only disadvantage is that you have to create fairly complex scripts by hand. This is where ISTool comes in. With this application you can edit these scripts in a visual environment, and creating these setup scripts becomes much easier. This version is the first release on CNET Download.com.