Inno Setup files periodically trigger AV warnings. One of the reasons is because of compression.
Virus signatures and compression both hold a common theme: Uniqueness and maximum entropy. This is why that happens.
Still, always double-check, but just be aware that the AV methods used will always have false positives. That will never stop. (Ok, it might stop if larger spaces are used, but that becomes impractical... so it will never stop.)