installer
noun [ C ]
uk/ɪnˈstɔːlər/ us/lɚ/ IT
a computer program that helps you put software onto a computer:
The latest version of this software has an improved installer with better junk mail filtering.
someone whose job is to put furniture, equipment, a machine, etc. into the correct position and make it ready to use:
The expert car seat installer said parents often try to install the seats themselves, but often don't do it right.