O Added StringToGUID, CreateComObject, and OleCheck support functions. Note: this is only supported by Unicode Inno Setup at the moment, because of Delphi 2's limitations (Delphi 2 is used to compile Non Unicode Inno Setup): See the new CodeAutomation2.iss example script for an example. Previously it only supported IDispatch based COM but a growing number of Windows API functions are COM based without implementing the IDispatch interface, and you can now use these as well. * Pascal Scripting now supports IUnknown based COM.

Note: Windows 7 only supports the display of values smaller than 4 GB. If an UninstallDisplaySize is not set, Setup estimates the size itself by taking the size of all files installed and adding any ExtraDiskSpaceRequired values set. On Windows 7 and newer, Setup uses this directive to set the EstimatedSize value in the Uninstall registry key when possible since the Windows 7 Add/Remove Programs Control Panel (called Program and Features) no longer automatically calculates it. O Added new section directive: UninstallDisplaySize. * Added the Windows 7 'compatibility' section to the various manifest resources used by Inno Setup.

O While running any PrepareToInstall event function Setup now displays the Preparing to Install wizard page instead of the Ready to Install page and disables itself. Returns an empty string if there's no previous installation or if UsePreviousAppDir is set to no or if Uninstallable was previously set to no. O WizardForm.PrevAppDir is now available and returns the directory of the previous installation.

If they are, at startup Setup will look in the registry to see if the same application is already installed, and if so, it will hide the pages automatically. * section directives DisableDirPage and DisableProgramGroupPage can now be set to auto. Its default value is VersionInfoProductVersion if set, else VersionInfoVersion. * Added new section directive: VersionInfoProductTextVersion, which sets the textual product version value. * section directives VersionInfoProductVersion now sets the binary product version value instead of the textual product version value.

Inno setup check if already installed