Inno Setup

Commonly used fields

[Files]
Source: "README.TXT"; DestDir: "{app}"; Flags: onlyifdoesntexist

• onlyifdoesntexist

  Only install the file if it doesn’t already exist on the user’s system.

• ignoreversion

  Don’t compare version info at all; replace existing files regardless of their version number.This flag should only be used on files private to your application, never on shared system files.