Office Removal Tool (o15-ctrremove.diagcab ) - Microsoft Q&A

According to a 2024 report by Kaspersky,

Create a NAND Backup: This is the most critical step. Before running any tool that modifies CTR files, use GodMode9 to create a full backup of your SysNAND.

: It was designed to completely scrub Microsoft Office installations—specifically Office 2013, 2016, and Office 365—from a Windows PC when the standard "Uninstall" option in the Control Panel failed. The "CTR" Meaning : "CTR" stands for Click-to-Run