site_archiver@lists.apple.com Delivered-To: installer-dev@lists.apple.com On 20 Jul 2007, at 11:16 AM, Chad Wagner wrote: — F _______________________________________________ Do not post admin requests to the list. They will be ignored. Installer-dev mailing list (Installer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/installer-dev/site_archiver%40lists.a... is there way that I can check during my installation whether my software has been installed before, even if it has since been completely uninstalled? any advice appreciated, thanks! If you mean _completely_ uninstalled — meaning that all trace of the software having been there is undetectable, then obviously you can't detect it. Most users are not so thorough. You might look for the preference file, or for the receipt (/Library/Receipts) from a previous installation. Your software might place an invisible "breadcrumb" file of zero length somewhere in the system for later installations to discover, but putting unauthorized files on other people's computers is evil. This email sent to site_archiver@lists.apple.com