You can extract the installer files through FTP download. Download the Informatica installation zip file from the Informatica Electronic Software Download site to a directory on your machine and then extract the installer files.
Make sure that you download the file to a local directory or a shared network drive that is mapped on your machine. You can then extract the installer files. However, you cannot run the installer from a mapped file. Copy the extracted files to a local drive and then run the installer.