If you need a lightweight or free productivity suite, there are much safer and more modern options available:

A repack is a version of a software package that has been modified by a third party. In the case of a 135 MB Office 2007 file, the creator has stripped away "non-essential" components—such as help files, clip art, templates, and multiple language supports—to shrink the original multi-gigabyte installer down to a fraction of its size. Why Do People Seek This Version?

Below is an overview of why these "135 MB repacks" exist, how they work, and why you should proceed with extreme caution.