The following are direct links to various Inquisit Lab and Inquisit Web installer packages that provide access to older versions of Inquisit as well as enabling pre-installation of Inquisit Web.
Latest release of Inquisit 4 Lab
Latest release of Inquisit 4 Web Player
Latest release of Inquisit 3 Desktop
Download the last release of Inquisit 1 (unsupported)