The window installation system comprises a kit of parts for protecting a window frame in a window installation process. The window frame (2) has a top frame member, a bottom frame member, and side frame members. The protection kit (10) comprises at least a bottom protection member (10), and possibly also side protection members (12, 13). Reinforcement sections (115, 116) are provided, and interior and exterior engagement flanges (1111, 1112) extend from the base portion (110) to engage the window frame (2).
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