Self Cert Mortgage - Version 1 A very simple and easy to use Self Certification Mortgage Search application. The downloadable version of this tool installs on any Windows operating system and if you are not currently a Windows user there is an online version that you can use with any operating system at our web site. The tool has also been optimized in terms of package size to make for a small download that should work very well even for people with a dial-up connection.