erm .. do you mean with Safari/Firefox or whichever browser you are using? Simply cancel the download. Download the old version: Lime Wire » Download Out-Of-Date Installers

Unlike windows users, the Mac OSX installer does not install over the internet. The files/data are all within the installer itself. It's an offline installer.

As for the Receipt folder, you would need to be logged into an admin account to remove that file called install limewire.pkg from the receipt folder. Example of where to find it here: Receipts folder sample image